2BUXD-SW128Wireless Earphone

Manual Product Specifications 1. Working Voltage: DC 3.7V 2. Charging Voltage: DC 5V/1A 3. Frequency Range: 2402 - 2480 MHz 4. Charging Time: Approximately 2 hours 5. Playback Time: 100% volume, lights on 6H, lights off 46H, lights off with ANC on 31H, lights on with ANC on 5H 6. Bluetooth Version: V5.4 7. Audio Decoding Format: AAC/SBC 8. Microphone Sensitivity: -42±3DB 9. Working Range: Approximately 10-15 meters Product Operation For first-time use, fully charge the headset battery. To charge, insert the USB charging cable into the charging port and connect to a power source. The indicator light will illuminate during charging and turn off when charging is complete (approximately 2 hours). When the headset battery level is below 3.3V, a voice prompt will sound; please charge the headset promptly. Power On/Off 1. Power On: Press and hold the power button for 3 seconds. The blue light will illuminate for 1 second and then turn off, followed by alternating red and blue flashing lights, indicating readiness for Bluetooth connection. 2. Power Off: Press and hold the power button for 3 seconds. The red indicator light will flash twice and then turn off. Bluetooth Usage Bluetooth mode provides wireless music playback functionality. In Bluetooth mode, the indicator light will show blue and red lights. Turn on the Bluetooth function on your mobile phone and search for the device name SW128. Select to connect. After successful connection, you can play music and make phone calls. Bluetooth Mode 1. Answering Calls: When a call comes in, single-click the multi-function button to answer. 2. Ending Calls: Press and hold the multi-function button to end the call. 3. Rejecting Calls: When a call comes in, press and hold the multi-function button (power button) to reject the call. 3. Press and hold the (+) or (-) buttons to select the desired song. 4. Single-click the multi-function button (power button) once to play/pause music; press again to resume playback. 5. Click the (+) or (-) volume buttons to adjust the volume. 6. Voice Assistant: Triple-click the multi-function button (power button) (if your phone supports this function). 7. Redial Last Number: Double-click the function button to automatically redial the last dialed number. ANC Mode 1. Click the ANC button; the green indicator light will stay on, entering noise cancellation mode. Click the ANC button again to exit noise cancellation mode. LED Mode 1. Click the LED button to enter LED mode. Click the LED button again to exit LED mode. Wired Headphone Function Insert the 3.5mm audio cable into the audio jack, and then plug the other end of the audio cable into your computer or other music device to use it as wired headphones. When using wired headphones, the MP3 and Bluetooth functions will not work, and you cannot adjust the volume through the headphones. FCC Warning 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. Note: 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 against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following 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. Note: The Grantee is not responsible for any changes or modifications not expressly approved by the party responsible for compliance. such modifications could void the user's authority to operate the equipment. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Rev 1/26/2023 INW INC Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 03‐04‐2026 Ref: Attestation Statements Part 2.911(d)(7) Filing FCC ID: 2BUXD-SW128 INW INC (“the applicant”) certifies that, as of the date of the filing of the application, we designate ourselves as the U.S. agent for service of process. Designated U.S. Agent Information: FRN: 0037859881 Name: INW INC Address: 5700 Stoneridge Mall Road, Suite 160, Pleasanton, Ca USA, 94588 Contact Person: Khalid Aldajani Tel.: (916) 370‐2662 Email: [email protected] Sincerely, INW INC Khalid Aldajani

(INW INC) (2026‐03‐04) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for (FCC ID: 2BUXD‐SW128) [INW INC] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber‐security or anti‐virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, (Applicant signature) (Khalid Aldajani) (INW INC) (2026‐03‐04) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for (FCC ID: 2BUXD‐SW128) [INW INC] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Khalid Aldajani)

INW INC Date: 03-04-2026 Federal Communications Commission Authorization and Evaluation Division Co nfidentiality Request regarding application for certification of FCC ID: 2BUXD-SW128 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Long-term confidentiality: Schematics Block Diagram Operational Description Schematics.pdf Block Diagram.pdf Operational Description.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, INW INC Signature Khal id Aldajani / President Typed name and Title

INW INC FCC ID: 2BUXD-SW128 POWER OF ATTORNEY Date: Mar.04, 2026 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 To Whom It May Concern: We, the undersigned, hereby authorize Waltek Testing Group Co., Ltd. (Deval Qin) on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by Waltek Testing Group Co., Ltd. (Deval Qin) on our behalf shall have the same effect as acts of our own. This authorization expires on Mar.03, 2027. Sincerely, INW INC Sig nature Khalid Aldajani / President Typed name and Title

Appendix- SW128-Photos Page 3 of 9 2. Photographs –Constructional Details 2.1. EUT – External View Model SW128 FCC ID: 2BUXD-SW128 Appendix- SW128-Photos Page 4 of 9 Appendix- SW128-Photos Page 5 of 9



Appendix- SW128-Photos Page 6 of 9 2.2. EUT – Internal View Model SW128 FCC ID: 2BUXD-SW128 Appendix- SW128-Photos Page 7 of 9 Appendix- SW128-Photos Page 8 of 9 Ant. Appendix- SW128-Photos Page 9 of 9 ======End======

TEST REPORT R eference No. .................... : WTD25D12345516W004 FCC ID ................................ : 2BUXD-SW128 Applicant ............................ : INW INC Address .............................. : 5700 Stoneridge Mall Road, Suite 160, Pleasanton, Ca USA, 94588 Manufacturer .................... : Somostel Group Electronic Co.,Limited Address ............................. : No.2101, No.12 Weigu Street, Liwan District, Guangzhou, China Product ............................... : Wireless Earphone Model(s). ............................ : SW128 Standards........................... : 47CFR FCC Part 2 Subpart J Section 2.1093 Date of Receipt Sample .... : 2026-01-07 Date of Test ....................... : 2026-01-08 to 2026-01-22 Date of Issue ...................... : 2026-01-22 Test Result ......................... : Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of compiler and approver. Prepared By: Waltek Testing Group Co., Ltd. Address: No. 77, Houjie Section, Guantai Road, Houjie Town, Dongguan City, Guangdong, China Tel: +86-769-2267 6998 Fax: +86-769-2267 6828 Compiled by: Approved by: Estel Qian / Project Engineer Deval Qin / Designated Reviewer Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Page 1 of 8 Reference No.: WTD25D12345516W004 Page 2 of 8 2. Contents Page 1 COVER PAGE ........................................................................................................................................... 1 2. CONTENTS ............................................................................................................................................... 2 3. REVISION HISTORY ................................................................................................................................. 3 4. GENERAL INFORMATION ....................................................................................................................... 4 4.1. GENERAL DESCRIPTION OF E.U.T.................................................................................................... 4 4.2. DETAILS OF E.U.T. ......................................................................................................................... 4 4.3. TEST FACILITY ................................................................................................................................ 5 4.4. SUBCONTRACTED ........................................................................................................................... 5 4.5. ABNORMALITIES FROM STANDARD CONDITIONS ................................................................................ 5 5. TEST SUMMARY ...................................................................................................................................... 6 6. RF EXPOSURE ......................................................................................................................................... 7 6.1. PROCEDURES AND REQUIREMENTS ................................................................................................. 7 6.2. CALCULATION METHOD ................................................................................................................... 7 6.3. TEST RESULT ................................................................................................................................. 8 Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Reference No.: WTD25D12345516W004 Page 3 of 8 3. Revision History Test Report No. Date of Receipt Sample Date of Test Date of Issue Purpose Comment Approved WTD25D12345516W004 2026-01-07 2026-01-08 to 2026-01-22 2026-01-22 Original - Valid Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Reference No.: WTD25D12345516W004 Page 4 of 8 4. General Information 4.1. General Description of E.U.T. Product: Wireless Earphone Model(s) : SW128 Model Description: N/A Test Sample No.: 1-1/1 BT Version: V5.4 Hardware Version: V12-AC7006F8-V1.3 Software Version: V2.13.17 4.2. Details of E.U.T. Operation Frequency: BT/BLE: 2402~2480MHz Max. RF output power: BT: -1.90dBm BLE 1M: -1.34dBm, BLE 2M: -1.27dBm Modulation Technology: BT: GFSK, π/4DQPSK, 8DPSK BLE: GFSK Antenna installation: PCB printed antenna Antenna Gain: -0.68dBi Note: #: The antenna gain is provided by the applicant, and the applicant should be responsible for its authenticity, WALTEK lab has not verified the authenticity of its information. Ratings: Charge voltage is DC 5V Battery: 3.7V 600mAh Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Reference No.: WTD25D12345516W004 Page 5 of 8 4.3. Test Facility The test facility has a test site registered with the following organizations: ISED CAB identifier: CN0013. Test Firm Registration No.: 7760A. Waltek Testing Group Co., Ltd. Has been registered and fully described in a report filed with the Industry Canada. The acceptance letter from the Industry Canada is maintained in our files. Registration number 7760A, October 15, 2016. FCC Designation No.: CN1201. Test Firm Registration No.: 523476. Waltek Testing Group Co., Ltd. EMC Laboratory has been registered and fully described in a report filed with the (FCC) Federal Communications Commission. The acceptance letter from the FCC is maintained in our files. Registration number 523476, September 10, 2019. 4.4. Subcontracted Whether parts of tests for the product have been subcontracted to other labs: Yes No If Yes, list the related test items and lab information: Test Lab: N/A Lab address: N/A Test items: N/A 4.5. Abnormalities from Standard Conditions None. Waltek Testing Group Co., Ltd. http://www.waltek.com.cn Reference No.: WTD25D12345516W004 Page 6 of 8 5. Test Summary Test Items Test Requirement Result Maximum Permissible Exposure (Exposure of Humans…

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Horizontal: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -40 Scale: 5/div Gain(dB) Frequency (MHz) Max Min Avg 2400 -1.73178 -30.0815 -8.48713 2450 -0.845801 -38.5605 -7.88012 2500 -0.685586 -24.0318 -6.79139 Vertical: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -30 Scale: 5/div Gain(dB) Frequency (MHz) Max Min Avg 2400 -6.1530 -24.1420 -13.0295 2450 -3.7054 -26.5836 -10.6700 2500 -2.32122 -30.4301 -9.70536 ANT Test Labs：Attestation of Global Compliance Co., Ltd.

TEST REPORT Reference No. .................... : WTD25D12345516W002 FCC ID ................................ : 2BUXD-SW128 Applicant ............................ : INW INC Address .............................. : 5700 Stoneridge Mall Road, Suite 160, Pleasanton, Ca USA, 94588 Manufacturer .................... : Somostel Group Electronic Co.,Limited Address ............................. : No.2101, No.12 Weigu Street, Liwan District, Guangzhou, China Product ............................... : Wireless Earphone Model(s). ............................ : SW128 Standards........................... : FCC 47CFR Part 15.247 Date of Receipt Sample .... : 2026-01-07 Date of Test ....................... : 2026-01-08 to 2026-01-22 Date of Issue ...................... : 2026-01-22 Test Result ......................... : Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of compiler and approver. Prepared By: Waltek Testing Group Co., Ltd. Address: No. 77, Houjie Section, Guantai Road, Houjie Town, Dongguan City, Guangdong, China Tel: +86-769-2267 6998 Fax: +86-769-2267 6828 Compiled by: Approved by: Estel Qian / Project Engineer Deval Qin / Designated Reviewer W altek Testing Group Co., Ltd. http://www.waltek.com.cn Page 1 of 78 Reference No.: WTD25D12345516W002 Page 2 of 78 2 Contents Page 1 COVER PAGE ........................................................................................................................................... 1 2 CONTENTS ............................................................................................................................................... 2 3 REVISION HISTORY ................................................................................................................................. 4 4 GENERAL INFORMATION ....................................................................................................................... 5 4.1 GENERAL DESCRIPTION OF E.U.T. ....................................................................................................... 5 4.2 DETAILS OF E.U.T. .............................................................................................................................. 5 4.3 CHANNEL LIST ..................................................................................................................................... 6 4.4 TEST MODE ........................................................................................................................................ 6 4.5 TEST FACILITY .................................................................................................................................... 7 5 TEST SUMMARY ...................................................................................................................................... 8 6 EQUIPMENT USED DURING TEST ......................................................................................................... 9 6.1 EQUIPMENTS LIST ............................................................................................................................... 9 6.2 DESCRIPTION OF SUPPORT UNITS ...................................................................................................... 10 6.3 MEASUREMENT UNCERTAINTY ........................................................................................................... 10 7 CONDUCTED EMISSION ....................................................................................................................... 11 7.1 E.U.T. OPERATION ............................................................................................................................ 11 7.2 EUT SETUP ...................................................................................................................................... 11 7.3 MEASUREMENT DESCRIPTION ............................................................................................................ 11 7.4 CONDUCTED EMISSION TEST RESULT ................................................................................................ 12 8 RADIATED SPURIOUS EMISSIONS ..................................................................................................... 14 8.1 EUT OPERATION ............................................................................................................................... 14 8.2 TEST SETUP ..................................................................................................................................... 15 8.3 SPECTRUM ANALYZER SETUP ............................................................................................................ 16 8.4 TEST PROCEDURE ............................................................................................................................. 17 8.5 CORRECTED AMPLITUDE & MARGIN CALCULATION .............................................................................. 17 8.6 SUMMARY OF TEST RESULTS ............................................................................................................. 18 9 CONDUCTED SPURIOUS EMISSIONS ................................................................................................. 21 9.1 TEST PROCEDURE ............................................................................................................................. 21 9.2 TEST RESULT .................................................................................................................................... 22 10 BAND EDGE MEASUREMENT .............................................................................................................. 37 10.1 TEST PROCEDURE ...................................................................................................…

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Appendix- SW128-Photos Page 1 of 9 1. Test Setup photos Model SW128 FCC ID: 2BUXD- SW128 1.1 Photograph – Radiated Emissions For 9kHz-30MHz Test Site 2# For 30MHz-1000MHz Test Site 2# Appendix- SW128-Photos Page 2 of 9 For Above 1GHz Test Site 1#