2BBCJ-RUMBLEM23NOISE-ISOLATING WIRELESS EARBUDS

FCC Warnning: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection againstharmful interference in a residential installation. This equipment generates, uses and can radiateradio frequency energy and, if not installed and used in accordance with the instructions, maycause harmful interference to radio communications. However, there is no guarantee thatinterference will not occur in a particular installation. If this equipment does cause harmfulinterference to radio or television reception, which can be determined by turning the equipmentoff and on, the user is encouraged to try to correct the interference by one or more of thefollowing measures: • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and receiver. • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 0cm between the radiator and your body.

Elgin Engineering LLC 2020 E Randol Mill Rd #307 Arlington Texas United States Applicant as U.S. Agent Letter of Attestation Date: 2025-12-23 To: Federal Communications Commission 7435 Oakland Mills Road, Columbia, MD 21046, USA Ref: Attestation Statement – Part 2.911(d)(7) filing FCC ID: 2BBCJ-RUMBLEM23 Elgin Engineering LLC (“the applicant”) as required by section 2.911(d)(7), will also serve as the agent for service of process for the above referenced FCC ID. The applicant acknowledges that they will maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. The applicant further acknowledges their responsibility to inform the FCC whenever the agent information changes. Designated U.S. Agent from Applicant Company Company Name: Elgin Engineering LLC Contact Person: James Ghormley Address: 2020 E Randol Mill Rd #307 Arlington Texas United States Tel.: +1 8176888381 Email: [email protected] FRN: 0033812421 Sincerely yours, Signature Printed Name: James Ghormley Title: Manager Email: [email protected]

Elgin Engineering LLC 2020 E Randol Mill Rd #307 Arlington Texas United States Attestation Statements Not Covered Entity Applicant & Not Covered Equipment To: Federal Communications Commission Date: 2025-12-23 7435 Oakland Mills Road, Columbia, MD 21046, USA Ref: Information Required by Section 2.911(d)(5)(i) & (ii) FCC ID: 2BBCJ-RUMBLEM23 Elgin Engineering LLC (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List, established pursuant to § 1.50002 of reference chapter, as an entity producing “covered” communication equipment. The equipment for which authorization is sought is not “covered” telecommunications equipment and video surveillance equipment produced by entities identified on the Commission’s Covered List that prohibited from receiving an equipment authorization pursuant to section § 2.903 of the FCC rules. Sincerely yours, Name/Title： James Ghormley/Manager Company: Elgin Engineering LLC Address: 2020 E Randol Mill Rd #307 Arlington Texas United States Phone: +1 8176888381 Fax: +1 8176888381 E-Mail: [email protected]

Elgin Engineering LLC 2020 E Randol Mill Rd #307 Arlington Texas United States 1 | P a g e Attestation Statements To: Federal Communications Commission Date: 2025-12-23 7435 Oakland Mills Road, Columbia, MD 21046, USA Subject: Attestation of Compliance with FCC Covered List Software Requirements FCC ID:2BBCJ-RUMBLEM23 Product Name:NOISE-ISOLATING WIRELESS EARBUDS This letter serves as an attestation that the equipment identified above ☐ is / ☒ is not (select one) "covered" software as defined under the Federal Communications Commission (FCC) Covered List requirements, as outlined in FCC 22-84 and KDB 986446. Specifically, the undersigned certifies that the equipment for which authorization is sought: 1. Does not contain cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors, assignees, parents, subsidiaries, affiliates, or any entity that has rebranded or relabeled software produced by the aforementioned entities. 2. Does not have the capability to store, run, or deliver any software identified on the FCC Covered List, including but not limited to cybersecurity and anti-virus software. To support this attestation, the appendix evaluation documentation has been prepared and is included in the certification filing. This attestation is based on a thorough evaluation of the device's design, functionality, and software environment. The undersigned affirms that the information provided is accurate and complete to the best of their knowledge. Sincerely yours, Name/Title： James Ghormley/Manager Company: Elgin Engineering LLC Address: 2020 E Randol Mill Rd #307 Arlington Texas United States Phone: +1 8176888381 Fax: +1 8176888381 E-Mail: [email protected] Elgin Engineering LLC 2020 E Randol Mill Rd #307 Arlington Texas United States 2 | P a g e Evaluation regarding to the Covered List Software: Compliance Methodology Evaluation Process Results Device is Inherent compliance ☒ The Chipset(s) used is limited to run the Cybersecurity or anti-virus software. The MCU “AC7003F4“, The RF chip “AC7003F4 “ don’t support the mentioned function. ☐ The Memory used is limited to run the Cybersecurity or anti-virus software. ☐ There is storage capacity limitation for store or install the Cybersecurity or anti-virus software. ☐ Operating system used is limited to run, install or deliver the Cybersecurity or anti-virus software. Device is not Inherent compliance ☐ Evaluation Based on Software Bill of Materials (SBoM) ☐ Evaluation Based on Scan for Software on the device ☐ Evaluation Based on Filesystem scan ☐ Evaluation Based on Running software check

Elgin Engineering LLC Add: 2020 E Randol Mill Rd #307 Arlington Texas United States Date: 2025-12-23 FCC ID: 2BBCJ-RUMBLEM23 Dear Sir/Madam, We, Elgin Engineering LLC Hereby declares the following statement for Federal Communications Commission, PCB board, circuit, structure and internal of these model(s) are the same, Only model number and colour is different for these model: Product name: NOISE-ISOLATING WIRELESS EARBUDS Model no.: RUMBLE M2.3, RUMBLE M2.2 Sincerely, Name/Title： James Ghormley/Manager Company: Elgin Engineering LLC Address: 2020 E Randol Mill Rd #307 Arlington Texas United States Phone: +1 8176888381 Fax: +1 8176888381 E-Mail: [email protected]

Elgin Engineering LLC 2020 E Randol Mill Rd #307 Arlington Texas United States Date: 2025-12-23 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request for: FCC ID: 2BBCJ-RUMBLEM23 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request permanent confidential treatment of the exhibits accompanying this certification application as outlined below : ⎯ Block Diagram ⎯ Schematics ⎯ Operational Description The above exhibits contain trade secrets and/or proprietary information that are not publicly available and materials that the Applicant has spent considerable efforts in developing. Public disclosure of these may be harmful to the Applicant and give an unfair advantage to competitors on the market. Sincerely, Name/Title： James Ghormley/Manager Company: Elgin Engineering LLC Address: 2020 E Randol Mill Rd #307 Arlington Texas United States Phone: +1 8176888381 Fax: +1 8176888381 E-Mail: [email protected]

Elgin Engineering LLC 2020 E Randol Mill Rd #307 Arlington Texas United States Date: 2025-12-23 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization for FCC ID: 2BBCJ-RUMBLEM23 I, the undersigned, hereby authorize (SHENZHEN CTA TESTING TECHNOLOGY CO., LTD.) to act on our behalf in all matters relating to this application for equipment certification. Any act carried out by (SHENZHEN CTA TESTING TECHNOLOGY CO., LTD.) shall have the same effect as our own and I acknowledge that all responsibility for complying with the terms and conditions of certification, as specified by DERYCOM CERTIFICATION SERVICES, INC., still resides with (Elgin Engineering LLC). We certify that we are not subject to a denial of federal benefits that includes FCC benefits pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. §862, and that no party to the application, as defined in 47 CFR §1.2002(b), is subject to a denial of federal benefits that includes FCC benefits pursuant to that section. Sincerely, Name/Title: James Ghormley/Manager Company: Elgin Engineering LLC Address: 2020 E Randol Mill Rd #307 Arlington Texas United States Phone: +1 8176888381 Fax: +1 8176888381 E-Mail: [email protected]

FCC ID:2BBCJ-RUMBLEM23 External Photos of the EUT FCC ID:2BBCJ-RUMBLEM23 FCC ID:2BBCJ-RUMBLEM23

Label and Location Size: L: 1.0cm*W: 0.4cm Label and Location FCC ID : 2BBCJ-RUMBLEM23

FCC ID:2BBCJ-RUMBLEM23 Internal Photos of the EUT FCC ID:2BBCJ-RUMBLEM23 ANT FCC ID:2BBCJ-RUMBLEM23 FCC ID:2BBCJ-RUMBLEM23

Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn RF Exposure evaluation Report Reference No. ..................... : FCC ID............................................. : CTA25120501102 2BBCJ-RUMBLEM23 Compiled by ( position+printed name+signature) . : File administrators Zoey Cao Supervised by ( position+printed name+signature) . : Project Engineer Ace Chai Approved by ( position+printed name+signature) . : RF Manager Eric Wang Date of issue .................................... : Dec. 11, 2025 Testing Laboratory Name .............. : Shenzhen CTA Testing Technology Co., Ltd. Address............................................ : Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Applicant’s name ............................ : Elgin Engineering LLC Address............................................ : 2020 E Randol Mill Rd #307 Arlington, TX 76011 Standard ........................................... : 47CFR §1.1310 47CFR §2.1093 KDB447498 D01 General RF Exposure Guidance v06 Shenzhen CTA Testing Technology Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purpses as long as the Shenzhen CTA Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen CTA Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description ..................... : NOISE-ISOLATING WIRELESS EARBUDS Trade Mark ....................................... : ELGIN USA Manufacturer .................................... : Elgin Engineering LLC Model/Type reference ...................... : RUMBLE M2.3 Listed Models ................................... : RUMBLE M2.2 Rating ............................................... : DC 3.7V From battery and DC 5.0V From external circuit Result ............................................... : PASS Report No.: CTA25120501102 Page 2 of 8 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn T E S T R E P O R T Equipment under Test : NOISE-ISOLATING WIRELESS EARBUDS Model /Type : RUMBLE M2.3 Listed Models : RUMBLE M2.2 Model difference : The PCB board, circuit, structure and internal of these models are the same, Only model number and colour is different for these model. Applicant : Elgin Engineering LLC Address : 2020 E Randol Mill Rd #307 Arlington, TX 76011 Manufacturer : Elgin Engineering LLC Address : 2020 E Randol Mill Rd #307 Arlington, TX 76011 Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: CTA25120501102 Page 3 of 8 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Contents 1 TEST STANDARDS ............................................................................................................ 4 2 SUMMARY .......................................................................................................................... 5 2.1 General Remarks ..................................................................................................... 5 2.2 Product Description ................................................................................................. 5 2.3 Special Accessories ................................................................................................. 5 2.4 Modifications ............................................................................................................ 5 3 TEST ENVIRONMENT ....................................................................................................... 6 3.1 Address of the test laboratory .................................................................................. 6 3.2 Test Facility .............................................................................................................. 6 3.3 Statement of the measurement uncertainty ............................................................. 6 4 Test limit .............................................................................................................................. 7 4.1 Requirement ............................................................................................................ 7 4.2 Conducted Power Results ....................................................................................... 7 4.3 Manufacturing tolerance .......................................................................................... 7 4.4 Evaluation Result ..................................................................................................... 8 4.5 Simultaneous Transmission for SAR Exclusion ...................................................... 8 5 Conclusion ........................................................................................................................... 8 Report No.: CTA25120501102 Page 4 of 8 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn 1 T E S T S T A N D A R D S…

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2.4GHz 3216 Chip Antenna: RANT3216F245X02 _ Application: WLAN,802.11b/g,Bluetooth,WLAN,etc... Features SMD,highreliability,ultraImpact,Omni-directional... PartnumberInformation RANT3216F245X02 (A)(B)(C)(D)(E)(F) ElectricalSpecification ThespecificationisdefinedonEVB. DimensionandTerminalConfiguration No.TerminalName 1Feeding/GNG 2GND/Feeding (A)ProductTypeChipAntenna (B)SizeCode 3.2x1.6mm( ± 0.2mm) (C)MaterialHighKmaterial (D)Frequency2.4~2.5GHz (E)FeedingmodePIFA&SingleFeeding (F)AntennatypeType=01 WorkingFrequencyRange2400~2500MHz Bandwidth120MHz(Min.) PeakGain1.24 dBi (Typ.) Impedance50Ohm Returnloss10dB(Min) PolarizationLinear AzimuthBeamwidthOmni-directional OperationTemperature(°C)-40~85°C ResistancetoSolderingHeats 10sec.(@280°C) TerminationNi/Au(Leadless) Dimension(mm) L 3.20±0.20 W 1.60±0.20 T 0.45±0.20 咏成國際科技有限公司電話 :13530576606 RAINInternationalTechnologyCo.,Ltd. TEL:13530576606 2.4GHz 3216 Chip Antenna: RANT3216F245X02 _ 1 EvaluationBoardReference PCBDimensionAntennaLayoutReference Unit:mm ElectricalCharacteristics ReturnLoss&Radiation ReturnLoss Frequency(MHz) S11(dB) 2400-10.50 2450-30.62 2500-11.47 Radiation 2400MHz2450MHz2500MHz Efficiency82.52%85.26%83.01% PeakGain1.15dBi1.24dBi1.19dBi Directivity1.89dBi1.97dBi1.91dBi X Y Z 2400MHz 2450MHz 2500MHz 2.4GHz 3216 Chip Antenna: RANT3216F245X02 _ TapingSpecifications ReelandTapingSpecification ReelSpecification TYPESIZEABCD 32167”5K/Reel 9.0±0.5 60±213.5±0.5178±2 TappingSpecification PackagingTypeABWEFGHTψDP PaperType3216 1.90±0.203.50±0.208.0±0.201.75±0.103.5±0.054.0±0.102.0±0.050.75±0.10 1.50±0.10 4.0±0.1 2.4GHz 3216 Chip Antenna: RANT3216F245X02 Reliability Table _ TestItemProcedure Requirements CeramicType Remark (Reference) Electrical Characterization Fulfilltheelectrical specification UserSpec. Thermal Shock 1.Preconditioning: 50±10°C/1hr,thenkeepfor24±1hrsatroomtemp. 2.Initialmeasure:Spec:referInitialspec. 3.Rapidchangeoftemperaturetest: -30°Cto+85°C;100cycles; 15minutesatLowercategorytemperature; 15minutesatUppercategorytemperature. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 107 Temperature Cycling 1.Initialmeasure:Spec:referInitialspec. 2.100Cycles(-30°Cto+85°C),SoakMode=1(2Cycle/hours). 3.Measurementat24±2Hoursaftertestcondition. NoVisibleDamage. Fulfilltheelectrical specification. JESD22 JA104 HighTemperature Exposure 1.Initialmeasure:Spec:referInitialspec. 2.Unpowered;500hours@T=+85°C. 3.Measurementat24±2hoursaftertest. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 108 LowTemperature Storage 1.Initialmeasure:Spec:referInitialspec. 2.Unpowered:500hours@T=-30°C. 3.Measurementat24±2hoursaftertest. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 108 Solderability (SMDBottomSide) Dippingmethod: a.Temperature:235±5°C b.Dippingtime:3±0.5s Thesoldershouldcover over95%ofthecritical areaofbottomside. IEC60384-21/22 4.10 SolderingHeat Resistance (RSH) Preheatingtemperature:150±10°C. Preheatingtime:1~2min. Soldertemperature:260±5°C. Dippingtime:5±0.5s NoVisibleDamage.IEC60384-21/22 4.10 Vibration5g'sfor20min.,12cycleseachof3orientations Note:Use8"X5"PCB.031"thick7securepointson,onelong sideand2securepointsatcornersofoppositesides.Parts mountedwithin2"fromanysecurepoint.Testfrom10-2000 Hz. NoVisibleDamage.MIL-STD-202 Method204 Mechanical Shock Threeshocksineachdirectionshallbeappliedalongthethree mutuallyperpendicularaxesofthetestspecimen(18shocks) Peakvalue:1,500g’s Duration:0.5ms Velocitychange:15.4ft/s Waveform:Half-sine NoVisibleDamage.MIL-STD-202 Method213 Humidity Bias 1.Humidity:85%R.H.,Temperature:85±2°C. 2.Time:500±24hours. 3.Measurementat24±2hrsaftertestcondition. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 Method106 2.4GHz 3216 Chip Antenna: RANT3216F245X02 _ Board Flex (SMD) 1.Mountingmethod: IR-Reflow.PCBSize(L:100×W:40×T:1.6mm) 2.Applytheloadindirectionofthearrowuntilbendingreaches 2mm. NoVisibleDamage.AEC-Q200 005 AdhesionForceof1.8Kgfor60seconds.NoVisibleDamage Magnificationof20Xor greatermaybeemployed forinspectionofthe mechanicalintegrityofthe devicebodyterminalsand body/terminaljunction. AEC-Q200 006 Physical Dimension Anyapplicablemethodusingx10magnification,micrometers, calipers,gauges,contourprojectors,orothermeasuring equipment,capableofdeterminingtheactualspecimen dimensions. Inaccordancewith specification. JESD22 JB100 RevisionHistory RevisionDateContent 12019/03/01NewDatasheet 22021/02/22Add2Dradiationcharacteristic

Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn FCC PART 15 SUBPART C TEST REPORT FCC PART 15.247 Report Reference No. .................... : FCC ID. ........................................... : CTA25120501101 2BBCJ-RUMBLEM23 Compiled by ( position+printed name+signature) . : File administrators Zoey Cao Supervised by ( position+printed name+signature) . : Project Engineer Ace Chai Approved by ( position+printed name+signature) . : RF Manager Eric Wang Date of issue .................................... : Dec. 11, 2025 Testing Laboratory Name .............. : Shenzhen CTA Testing Technology Co., Ltd. Address ............................................ : Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Applicant’s name ........................... : Elgin Engineering LLC Address ............................................ : 2020 E Randol Mill Rd #307 Arlington, TX 76011 Test specification ........................... : Standard ........................................... : FCC Part 15.247 Shenzhen CTA Testing Technology Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen CTA Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen CTA Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description ..................... : NOISE-ISOLATING WIRELESS EARBUDS Trade Mark ....................................... : ELGIN USA Manufacturer .................................... : Elgin Engineering LLC Model/Type reference ...................... : RUMBLE M2.3 Listed Models ................................... : RUMBLE M2.2 Modulation ....................................... : GFSK, Π/4DQPSK Frequency ........................................ : From 2402MHz to 2480MHz Ratings ............................................. : DC 3.7V From battery and DC 5.0V From external circuit Result ............................................... : PASS Report No.: CTA25120501101 Page 2 of 38 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn T E S T R E P O R T Equipment under Test : NOISE-ISOLATING WIRELESS EARBUDS Model /Type : RUMBLE M2.3 Listed Models : RUMBLE M2.2 Model difference : The PCB board, circuit, structure and internal of these models are the same, Only model number and colour is different for these model. Applicant : Elgin Engineering LLC Address : 2020 E Randol Mill Rd #307 Arlington, TX 76011 Manufacturer : Elgin Engineering LLC Address : 2020 E Randol Mill Rd #307 Arlington, TX 76011 Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: CTA25120501101 Page 3 of 38 Shenzhen CTA Testing Technology Co., Ltd. Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao’an District, Shenzhen, China Tel:+86-755 2322 5875 E-mail:[email protected] Web:http://www.cta-test.cn Contents 1 TEST STANDARDS ...................................................................................................................................... 4 2 SUMMARY .................................................................................................................................................... 5 2.1 General Remarks .............................................................................................................................. 5 2.2 Product Description ........................................................................................................................... 5 2.3 Equipment Under Test ....................................................................................................................... 5 2.4 Short description of the Equipment under Test (EUT) ...................................................................... 5 2.5 EUT configuration .............................................................................................................................. 6 2.6 EUT operation mode ......................................................................................................................... 6 2.7 Block Diagram of Test Setup ............................................................................................................. 6 2.8 Related Submittal(s) / Grant (s) ......................................................................................................... 6 2.9 Modifications ...................................................................................................................................... 6 3 TEST ENVIRONMENT ................................................................................................................................. 7 3.1 Address of the test laboratory............................................................................................................ 7 3.2 Test Facility ....................................................................................................................................... 7 3.3 Environmental conditions .................................................................................................................. 7 3.4 Summary of measurement …

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1 FCC Appendix RF Test Data for BT FCC ID : 2BBCJ-RUMBLEM23 Company : Elgin Engineering LLC EUT : NOISE-ISOLATING WIRELESS EARBUDS Model Number : RUMBLE M2.3 Report No. : CTA25120501101 Reviewed By : Eric Wang 2 Appendix A: 20dB Emission Bandwidth Test Result TestMode Antenna Freq(MHz) 20dB EBW[MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.942 2401.550 2402.492 --- --- 2441 0.957 2440.547 2441.504 --- --- 2480 0.939 2479.550 2480.489 --- --- 2DH5 Ant1 2402 1.323 2401.346 2402.669 --- --- 2441 1.278 2440.382 2441.660 --- --- 2480 1.332 2479.346 2480.678 --- --- 3 Test Graphs DH5_Ant1_2402 DH5_Ant1_2441 DH5_Ant1_2480 4 2DH5_Ant1_2402 2DH5_Ant1_2441 5 2DH5_Ant1_2480 6 Appendix B: Occupied Channel Bandwidth Test Result TestMode Antenna Freq(MHz) OCB [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.86864 2401.5728 2402.4414 --- --- 2441 0.87912 2440.5705 2441.4496 --- --- 2480 0.87389 2479.5719 2480.4458 --- --- 2DH5 Ant1 2402 1.1840 2401.4184 2402.6024 --- --- 2441 1.1924 2440.4149 2441.6073 --- --- 2480 1.1879 2479.4173 2480.6052 --- --- 7 Test Graphs DH5_Ant1_2402 DH5_Ant1_2441 DH5_Ant1_2480 8 2DH5_Ant1_2402 2DH5_Ant1_2441 9 2DH5_Ant1_2480 10 Appendix C: Maximum conducted output power Test Result Peak Test Mode Antenna Freq(MHz) Conducted Peak Powert[dBm] Conducted Limit[dBm] Verdict DH5 Ant1 2402 0.26 ≤20.97 PASS 2441 0.01 ≤20.97 PASS 2480 -0.12 ≤20.97 PASS 2DH5 Ant1 2402 -0.52 ≤20.97 PASS 2441 -0.80 ≤20.97 PASS 2480 -0.90 ≤20.97 PASS 11 Appendix D: Carrier frequency separation Test Result TestMode Antenna Freq(MHz) Result[MHz] Limit[MHz] Verdict DH5 Ant1 Hop 1.036 ≥0.957 PASS 2DH5 Ant1 Hop 1.14 ≥0.888 PASS 12 Test Graphs DH5_Ant1_Hop 2DH5_Ant1_Hop 13 Appendix E: Time of occupancy Test Result TestMode Antenna Freq(MHz) BurstWidth [ms] TotalHops [Num] Result[s] Limit[s] Verdict DH1 Ant1 Hop 0.390 312 0.122 ≤0.4 PASS DH3 Ant1 Hop 1.640 145 0.238 ≤0.4 PASS DH5 Ant1 Hop 2.890 107 0.309 ≤0.4 PASS 2DH1 Ant1 Hop 0.390 315 0.123 ≤0.4 PASS 2DH3 Ant1 Hop 1.650 156 0.257 ≤0.4 PASS 2DH5 Ant1 Hop 2.900 108 0.313 ≤0.4 PASS 14 Test Graphs DH1_Ant1_Hop DH3_Ant1_Hop 15 DH5_Ant1_Hop 16 2DH1_Ant1_Hop 2DH3_Ant1_Hop 17 2DH5_Ant1_Hop 18 19 Appendix F: Number of hopping channels Test Result TestMode Antenna Freq(MHz) Result[Num] Limit[Num] Verdict DH5 Ant1 Hop 79 ≥15 PASS 2DH5 Ant1 Hop 79 ≥15 PASS 20 Test Graphs DH5_Ant1_Hop 2DH5_Ant1_Hop 21 Appendix G: Band edge measurements Test Result TestMode Antenna ChName Freq(MHz) RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 Low 2402 -0.46 -54.88 ≤-20.46 PASS High 2480 -0.46 -60.28 ≤-20.46 PASS Low Hop_2402 -4.59 -60.62 ≤-24.59 PASS High Hop_2480 -3.74 -63 ≤-23.74 PASS 2DH5 Ant1 Low 2402 -4.04 -60.86 ≤-24.04 PASS High 2480 -6.45 -61.56 ≤-26.45 PASS Low Hop_2402 -6.32 -62.81 ≤-26.32 PASS High Hop_2480 -5.16 -64.72 ≤-25.16 PASS 22 Test Graphs DH5_Ant1_Low_2402 DH5_Ant1_High_2480 DH5_Ant1_Low_Hop_2402 23 DH5_Ant1_High_Hop_2480 2DH5_Ant1_Low_2402 24 2DH5_Ant1_High_2480 2DH5_Ant1_Low_Hop_2402 2DH5_Ant1_High_Hop_2480 25 26 Appendix H: Conducted Spurious Emission Test Result TestMode Antenna Freq(MHz) FreqRange [MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 2402 Reference -0.12 -0.12 --- PASS 30~1000 -0.12 -67.54 ≤-20.12 PASS 1000~26500 -0.12 -42.64 ≤-20.12 PASS 2441 Reference -0.17 -0.17 --- PASS 30~1000 -0.17 -68.37 ≤-20.17 PASS 1000~26500 -0.17 -43.21 ≤-20.17 PASS 2480 Reference -1.10 -1.10 --- PASS 30~1000 -1.10 -67.76 ≤-21.1 PASS 1000~26500 -1.10 -43.41 ≤-21.1 PASS 2DH5 Ant1 2402 Reference -6.31 -6.31 --- PASS 30~1000 -6.31 -66.19 ≤-26.31 PASS 1000~26500 -6.…

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