2AIXN-NC4TWS Bluetooth Headset

版本：V1.0 修改时间：2023-6-07 版本变更： 料号： 成品尺寸：73x73mm 颜色：1C+1C 材质：128g哑粉纸，正反面过哑油 页数：12P 装订方式：风琴折 Charging ※ When the power of the charging case is ultra low,the charging case will not charge the earbuds.Please get the case charged first. Charging case battery state （lights on for 10s）： 3 ndicator light always on； Indicator light blink.※ 1 Earbuds Charging 2 Charging Case Charging Red Low battery Blue Medium battery Blue Medium battery Green High battery Green High battery No lights full charge Red Low battery Factory Reset ※ Please delete the pairing record from your Bluetooth device before the reset. Do the pairing again to connect to your Bluetooth device after reset. Place the earbuds into the charging case, leave the lid open.Press and hold the Function button for 6 seconds until the case indicator blinks in six times. The earbuds have been reset. BS377Z2E-1 快速指南 Touch Controls Ta p Press and hold 2 × 1 × 2 × 2 × 2 × 2 × 2 Play / Pause Answer / End calls Gaming Mode on/off End current call and answer second call Hold current call and answer second call Switch between two calls End the current call when on two Pre. Track Next Track L R 3 Voice Assistants × 3L 6 5 4 No.FunctionOperationVoice Prompt 7 8 9 10 11 12 13 14 2s/1Open the case lidPower OnPower on 2 Put the earbuds back into the case and close lid Power OffPower off Gaming mode On/ Gaming mode Off Transparency On/ ANC On/ DuDu ANC / Transparency / Off × 3R 2 s 2 s 2 s Reject calls2 s ※To handle the second call, please make sure your Bluetooth device supports HFP1.5, and please turn on the waiting function of the Bluetooth device. Open the case lid with the earbuds inside,the earbuds are ready for pairing. Turn on Bluetooth on your phone,search for“BS377Z2E-1”from the device list to complete pairing. 1 Bluetooth Pairing ※ M号耳帽已预装在耳机上。 S LM Pick your ear tips Proper size ear tips are very important for sound quality and comfort. Please try the ear tip of different sizes. Please note that different sizes of ear tips may be required for your left and right ears. BS377Z2E-1 Bluetooth Function button Dual device connection Turn off the Bluetooth of the first device, or put the earbuds into the case and long press the button for 3 seconds, the earbuds enter into the pairing state, use the second device to search the pairing name to complete pairing. After the second device is successfully connected to the earbuds, open the Bluetooth of the first device, the earbuds will re-connect to the first device, then the earbuds is connected to two devices at the same time. ※ When the earbuds is connected to two devices, it can only play the sound of one device, and the priority of call higher than music and video. The operation of the earbuds controls the device that is currently sounding. Battery safety • The product is equipped with a non removable built-in battery. Do not replace the battery by yourself to avoid damaging the battery or product. Dispose of used batteries according to local instructions. • Do not disassemble or modify the battery, immerse in water or other liquids to avoid battery leakage, overheating, fire or explosion. • Do not drop, squeeze or puncture the battery. Avoid exposing the battery to external pressure, which may cause internal short circuit and overheating of the battery. Maintenance • When the product is not in use, please put it back into the charging case forcharging. • Please charge the product every 3-6 months to avoid battery depletion due to long-time storage. • Please keep the product and its accessories dry, and do not use external heating equipment such as microwave oven or hair dryer to dry them. • Do not place the product and its accessories in areas where the temperature is too high or too low. • Before cleaning and maintenance, please turn off the product and disconnect with the power source. • Do not use chemicals, cleaning agents or detergents to clean the product or its accessories. Please use clean, dry soft cloth to do the clean. • Do not disassemble or modify the product and its accessories without authorization, otherwise the equipment and accessories will not be covered by our warranty. Please contact the authorized service center in case of product broken. Environmental protection • Please comply with the local regulations on the disposal and the recycling. Safety instructions Read through the safety instructions before using the product. Electronic equipment • Do not use this product in places where wireless devices are prohibited, otherwise it will interfere with other electronic devices or cause other hazards. Medical and health care equipment • Do not use this product in medical and health care places where wireless devices are prohibited, please follow the regulations of the places and turn off the product. • The radio waves generated by the product may affect the normal operation of implantable medical devices or personal medical devices, such as pacemakers, Cochlear implants, hearing aids, etc. If you use these medical devices, please consult their manufacturer for restrictions. • When using this product, please keep at least 15cm away from the implanted medical devices (such as pacemakers, cochlear implants, etc.). Hearing protection • When you listen to music or make call with this product, it is recommended to use the minimum volume to avoid hearing damage. Long term use of high volume may cause permanent hearing loss. Traffic safety • Using high volume while driving may distract attention and cause accidents. • The electronic equipment of the car may fail into work due to the radio nterference of the product. Please contact the manufacturer for details. • Wireless equipment may interfere with the flight system of the aircraft. Please comply with the relevant provisions of the airline on how to use this product on flight. 67 Additional instructions • This product conforms to a specific Bluetooth version and is not guaranteed to be compatible with the functions of all Bluetooth devices. P…

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GUANGZHOUU&ITECHNOLOGYCOMPANYLIMITED 4thFloor,15thBuilding,VtrekInnovationIndustrialPark,No.644,ShibeiRoad,PanyuDistrict, Guangzhou,China FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:05-31-2023 Ref:AttestationStatementsPart2.911(d)(5)(i)Filing FCCID:2AIXN-NC4 [GUANGZHOUU&ITECHNOLOGYCOMPANYLIMITED](“theapplicant”)certifiesthattheequipmentfor whichauthorizationissoughtisnot“covered”equipmentprohibitedfromreceivinganequipment authorizationpursuanttosection2.903oftheFCCrules. Sincerely, (Applicantsignature) (PaulHe)

GUANGZHOUU&ITECHNOLOGYCOMPANYLIMITED 4thFloor,15thBuilding,VtrekInnovationIndustrialPark,No.644,ShibeiRoad,PanyuDistrict, Guangzhou,China FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:05-31-2023 Ref:AttestationStatementsPart2.911(d)(5)(ii)Filing FCCID:2AIXN-NC4 [GUANGZHOUU&ITECHNOLOGYCOMPANYLIMITED](“theapplicant”)certifiesthat,asofthedateof thefilingoftheapplication,theapplicantisnotidentifiedontheCoveredListasanentityproducing “covered”equipment. Sincerely, (Applicantsignature) (PaulHe)

GUANGZHOUU&ITECHNOLOGYCOMPANYLIMITED 4thFloor,15thBuilding,VtrekInnovationIndustrialPark,No.644,ShibeiRoad,PanyuDistrict, Guangzhou,China Date:May31,2023 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 FCCID:2AIXN-NC4 USAgent–AttestationStatement/Part2.911(d)(7) [GUANGZHOUU&ITECHNOLOGYCOMPANYLIMITED]certifies,thatasof[May31,2023],we havedesignatedFCCUSAgent,LLCtoacceptserviceofprocessonourbehalfforFCCID: 2AIXN-NC4. [GUANGZHOUU&ITECHNOLOGYCOMPANYLIMITED],acceptstomaintainanagentof serviceofprocessintheUnitedStatesfornolessthanoneyearaftereitherthegranteehas permanentlyterminatedallmarketingandimportationoftheapplicableequipmentwithintheU.S., ortheconclusionofanyCommission-relatedadministrativeorjudicialproceedinginvolvingthe equipment,whicheverislater. FCCUSAgent,LLC,acceptsasofthedateofthefilingofthisapplication,theobligationofbeing thedesignatedagentforthepurposeofacceptingserviceofprocessonbehalfof[GUANGZHOU U&ITECHNOLOGYCOMPANYLIMITED]forFCCID:2AIXN-NC4. DesignatedAgentInformation: CompanyName:FCCUSAgent,LLC FRN:0033402884 Address:3722IllinoisAvenue,SaintCharles,IL,60174,USA ContactPerson:TimPayne Phone:708-571-3148 Email:[email protected] Sincerely, Company:[GUANGZHOUU&ITECHNOLOGY COMPANYLIMITED] DesignatedAgent:FCCUSAgent,LLC CompanyRepresentative:[PaulHe] Tel:020-31127992 Email:[email protected] DesignatedAgentRepresentative:TimPayne Signature:Signature:

GUANGZHOU U&I TECHNOLOGY COMPANY LIMITED 4th Floor,15th Building,Vtrek Innovation Industrial Park,No.644 Shibei Road,Panyu District, Guangzhou, China Jun. 20, 2023 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Subject: Explanation of differences between product types FCC ID : 2AIXN-NC4 Model Number: BS377Z2E-1, NC4, NC4pro, NC4plus, BS377Z2E-2, BS377Z2E-3, BS377Z2E-4, BS377Z2E-5, BS377Z2E-6, BS377Z2E-7, BS377Z2E-8, BS377Z2E-9 To Whom It May Concern: We, The GUANGZHOU U&I TECHNOLOGY COMPANY LIMITED hereby declare that the models are identical except the the model name and color. Except for the different above, no other modification is performed. Sincerely, Signature: Contact person: Paul He

GUANGZHOU U&I TECHNOLOGY COMPANY LIMITED Agent Authorization Company: GUANGZHOU U&I TECHNOLOGY COMPANY LIMITED Address: 4th Floor,15th Building,Vtrek Innovation Industrial Park,No.644 Shibei Road,Panyu District, Guangzhou, China Product Name: TWS Bluetooth Headset Model Number(s): BS377Z2E-1, NC4, NC4pro, NC4plus, BS377Z2E-2, BS377Z2E-3, BS377Z2E-4, BS377Z2E-5, BS377Z2E-6, BS377Z2E-7, BS377Z2E-8, BS377Z2E-9 Product Description: TWS Bluetooth Headset We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature: Date: 2023-06-20 Name: Paul He Company: GUANGZHOU U&I TECHNOLOGY COMPANY LIMITED

GUANGZHOUU&ITECHNOLOGYCOMPANYLIMITED 4thFloor,15thBuilding,VtrekInnovationIndustrialPark,No.644,ShibeiRoad,PanyuDistrict, Guangzhou,China OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USA Date:05-31-2023 Subject;RequestforConfidentiality FCCID:2AIXN-NC4 ToWhomItMayConcern, PursuanttotheprovisionsoftheCommission’srulesTitle47Sections§0.457and§0.459,we arerequestingtheCommissiontowithholdthefollowingattachment(s)asconfidential documentsfrompublicdisclosureindefinitely. Thesedocumentscontaindetailedsystemandequipmentdescriptionsandareconsideredas proprietaryinformationinoperationoftheequipment.Thepublicdisclosureofthesedocuments mightbeharmfultoourcompanyandwouldgivecompetitorsanunfairadvantageinthemarket. SchematicDiagram BlockDiagram PartsList OperationalDescription Tune-upProcedure Inadditionaltoabovementioneddocuments,inordertocomplywiththemarketingregulations inTitle47CFR§2.803andtheimportationrulesinTitle47CFR§2.1204,whileensuringthat businesssensitiveinformationremainsconfidentialuntiltheactualmarketingofnewly authorizeddevices,werequestShortTermConfidentialityofthefollowingattachment(s); ExternalPhotos TestSetupPhotos InternalPhotos UserManual For45days,pursuanttoPublicNoticeDA04-1705. OR For180dayspursuanttoKDB726920D01. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondenceduringthecertificationreviewprocesscannotbegrantedasconfidential documentsandthisinformationwillbeavailableforpublicreviewoncethegrantofequipment authorizationisissued. Sincerely Contactperson: PaulHe

Report No.: AGC01082230502AP03 Page 1 of 7 EXTERNAL PHOTOS WHOLE VIEW OF EUT TOP VIEW OF EUT Report No.: AGC01082230502AP03 Page 2 of 7 BOTTOM VIEW OF EUT FRONT VIEW OF EUT Report No.: AGC01082230502AP03 Page 3 of 7 BACK VIEW OF EUT LEFT VIEW OF EUT Report No.: AGC01082230502AP03 Page 4 of 7 RIGHT VIEW OF EUT WHOLE VIEW OF EUT Report No.: AGC01082230502AP03 Page 5 of 7 TOP VIEW OF EUT BOTTOM VIEW OF EUT Report No.: AGC01082230502AP03 Page 6 of 7 FRONT VIEW OF EUT BACK VIEW OF EUT Report No.: AGC01082230502AP03 Page 7 of 7 LEFT VIEW OF EUT RIGHT VIEW OF EUT ****************************************End of Report*************************************

FCC ID Label Location The product does not have enough space to place the label, and FCC ID label is reflected in the user manual and package, as below:

Report No.: AGC01082230502AP03 Page 1 of 12 INTERNAL PHOTOS Left - VIEW OF EUT(PORT) OPEN VIEW OF EUT Report No.: AGC01082230502AP03 Page 2 of 12 VIEW OF BATTERY INTERNAL VIEW OF EUT (FIGURE 1) Report No.: AGC01082230502AP03 Page 3 of 12 INTERNAL VIEW OF EUT (FIGURE 2) INTERNAL VIEW OF EUT (FIGURE 3) BT Antenna Report No.: AGC01082230502AP03 Page 4 of 12 Right VIEW OF EUT(PORT) OPEN VIEW OF EUT Report No.: AGC01082230502AP03 Page 5 of 12 VIEW OF BATTERY INTERNAL VIEW OF EUT (FIGURE 1) Report No.: AGC01082230502AP03 Page 6 of 12 INTERNAL VIEW OF EUT (FIGURE 2) INTERNAL VIEW OF EUT (FIGURE 3) BT Antenna Report No.: AGC01082230502AP03 Page 7 of 12 Left VIEW OF EUT(PORT) OPEN VIEW OF EUT Report No.: AGC01082230502AP03 Page 8 of 12 VIEW OF BATTERY INTERNAL VIEW OF EUT (FIGURE 1) Report No.: AGC01082230502AP03 Page 9 of 12 INTERNAL VIEW OF EUT (FIGURE 2) INTERNAL VIEW OF EUT (FIGURE 3) BT Antenna Report No.: AGC01082230502AP03 Page 10 of 12 Right VIEW OF EUT(PORT) OPEN VIEW OF EUT Report No.: AGC01082230502AP03 Page 11 of 12 VIEW OF BATTERY INTERNAL VIEW OF EUT (FIGURE 1) Report No.: AGC01082230502AP03 Page 12 of 12 INTERNAL VIEW OF EUT (FIGURE 2) INTERNAL VIEW OF EUT (FIGURE 3) ****************************************End of Report************************************* BT Antenna

RF EXPOSURE EVALUATION 1. PRODUCT INFORMATION FCC ID 2AIXN-NC4 Product Description TWS Bluetooth Headset Model Name BS377Z2E-1, NC4, NC4pro, NC4plus, BS377Z2E-2, BS377Z2E-3, BS377Z2E-4, BS377Z2E-5, BS377Z2E-6, BS377Z2E-7, BS377Z2E-8, BS377Z2E-9 Frequency Band (Operating) WLAN: 2.412GHz ~ 2.462GHz WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz WLAN: 5.745GHz ~ 5825GHz Bluetooth: 2.402GHz ~ 2.480GHz Others (NFC:13.56MHz) Device Category Portable (<20cm separation) Mobile (>20cm separation) Others: Antenna Diversity Single antenna Multiple antennas Max. Output Power Left ear earphone: -9.454dBm (Max) Antenna Gain 3.4dBi Minimum Assessment Distance 5mm Evaluation Applied MPE Evaluation SAR Evaluation Evaluation Result Pass 2. PORTABLE DEVICE EVALUATION METHOD AND LIMIT Following FCC KDB 447498 D01 “General SAR test exclusion guidance” The corresponding SAR Exclusion Threshold condition, listed below: 1) The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] [if(GHz)] s 3.0 for 1-g SAR and ñ 7.5 for 10-g extremity SAR, where  f(GHz) is the RF channel transmit frequency in GHz.  Power and distance are rounded to the nearest mW and mm before calculation.  The result is rounded to one decimal place for comparison The test exclusions are applicable only when the minimum test separation distance is ≤50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. 2) At 100 MHz to 6 GHz and for test separation distances > 50 mm, the SAR test exclusion threshold is determined according to the following: a) [Threshold at 50 mm in step 1) + (test separation distance - 50mm) ( f(MHz)/150)] mW, at 100MHz to 1500 MHz; b) [Threshold at 50 mm in step 1) + (test separation distance - 50 mm)-10] mW at > 1500 MHz and ≤6 GHz; 3) At frequencies below 100 MHz, the following may be considered for SAR test exclusion. a) The threshold at the corresponding test separation distance at 100 MHz in step 2) is multiplied by [1 + log(100/f(MHz))] for test separation distances > 50 mm and < 200 mm. b) The threshold determined by the equation in a) for 50 mm and 100 MHz is multiplied by 1/2 for test separation distances ñ 50 mm. c) SAR measurement procedures are not established below 100 MHz. When SAR test exclusion cannot be applied, a KDB inquiry is required to determine SAR evaluation requirements for any test results to be acceptable. 3. MOBILE DEVICE EVALUATION METHOD AND LIMIT Human exposure to RF emissions from mobile devices (47 CFR §2.1091) may be evaluated based on the MPE limits adopted by the FCC for electric and magnetic field strength and/or power density, as appropriate, since exposures are assumed to occur at distances of 20 cm or more from persons. LIMITS FOR GENERAL POPULATION / UNCONTROLLED EXPOSURE Frequency Range (MHz) E-field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/cm 2 ) Averaging Time |E| 2 , |H| 2 or S (Minutes) 0.3 -- 1.34 614 1.63 (100)* 30 1.34 -- 30 824/f 2.19/f (180/f 2 )* 30 30 -- 300 27.5 0.073 0.2 30 300 -- 1500 -- -- f/1500 30 1500 -- 100,000 -- -- 1.0 30 *Note: 1. f= Frequency in MHz * Plane-wave Equivalent Power Density 2. The averaging time for General Population/Uncontrolled exposure to fixed transmitters is not applicable for mobile and portable transmitters. See 47 CFR §§2.1091 and 2.1093 on source-based time-averaging requirement for mobile and portable transmitters. S=PG/4πR² Where: S=power density P=power input to antenna G=power gain of the antenna in the direction of interest relative to an isotropic radiator R=distance to the center of radiation of the antenna 4. MEASUREMENT RESULT Test Mode Channel Frequency (MHz) Max Output power (dBm) Max Output power (mW) Calculati on Value (Note 1) Threshold Value 8DPSK BT_EDR 2402 -9.454 0.11 0.034 3.0 Note 1: Calculation Value =[(max. power of channel, mW)/(min. test separation distance, mm)] ·[√f(GHz)]. Fox example: 0.11/5*√2.402=0.034 ≤ 3.0 According to KDB447498 D01 V06, threshold at which no SAR required is ≤3.0 for 1-g SAR, separation distance is 5mm, and no simultaneous SAR measurement is required. 5. CONCLUSION Since Source-base time average power is below SAR test exclusion power thresholds, the SAR evaluation is not required.

SymbolsLWTA Dimensions1.60±0.200.80±0.200.80±0.200.30±0.10 NumberTerminal Name ① INPUT ② NC Dimensions（Unit：mm） L w ①② T ( Side View ) ( Bottom View ) ( Top View ) A Features 1.Surface Mounted Devices with a small dimension of 1.6 x 0.8 x 0.8 mm meet future miniaturization trend. 2,Embedded and LTCC (low temperature co-fired ceramic) technology is able to integrate with system design as well as beatifying the housing of final product. 3.High stability and low tolerance. Applications 1.Bluetooth 2.Wireless LAN 3.ISM band 2.4GHz wireless applications www.surbaner.com.cn SBR Communication has possession of proprietary information provided in this report and this proprietary information shall be kept in strict confidence and not disclosed to any person or firm without the prior written consent of SBR Communication Technology. . Page 1 P/N: SURL160808 SRF08 Evaluation Board and Matching Circuits www.surbaner.com.cn SBR Communication has possession of proprietary information provided in this report and this proprietary information shall be kept in strict confidence and not disclosed to any person or firm without the prior written consent of SBR Communication Technology. . Page 2 P/N: SURL160808 SRF08 Electrical Characteristics Characteristic curve www.surbaner.com.cn SBR Communication has possession of proprietary information provided in this report and this proprietary information shall be kept in strict confidence and not disclosed to any person or firm without the prior written consent of SBR Communication Technology. . Page 3 FeatureSpecification 1 Central frequency2445MHz 2 Bandwidth>100MHz 3 Peak gain3.4dBi 4 VSWR<2 5 PolarizationLinear 6 Azimuth beamwidthOmnidirectional 7 Impedance50 Ω P/N: SURL160808 SRF08 Radiation Pattern coordinates： Y-Z Plane X-Z Plane www.surbaner.com.cn SBR Communication has possession of proprietary information provided in this report and this proprietary information shall be kept in strict confidence and not disclosed to any person or firm without the prior written consent of SBR Communication Technology. . Page 4 P/N: SURL160808 SRF08 3D Radiation Pattern www.surbaner.com.cn SBR Communication has possession of proprietary information provided in this report and this proprietary information shall be kept in strict confidence and not disclosed to any person or firm without the prior written consent of SBR Communication Technology. . Page 5 X-Y Plane Frequency 2400MHz2450MHz2500MHz Avg. gain-1.14-0.85-1.30 Peak gain23.42.5 Efficiency77%82%78% P/N: SURL160808 SRF08 Moisture Proof Temperature：40±2°C Humidity：90~95%RH Duration：500h Recovery conditions：Room temperature Recovery Time：24h (Class1) or 48h (Class2) Sol derabi li ty At least 95% of the terminal electrode is covered by new solder.Preheating conditions:80 to 120°C; 10~30s. SolderTe m p e r at u r e :2 3 5 ± 5°C Duration:2 ±0.5s , SolderTempe r atu re:24 5±5°C Du rat ion:2±0.5s Optimum Solder Amount for Reflow Soldering www.surbaner.com.cn SBR Communication has possession of proprietary information provided in this report and this proprietary information shall be kept in strict confidence and not disclosed to any person or firm without the prior written consent of SBR Communication Technology. . Page 6 Dependability Test Test Temperature: Operating Temperature Temperature Relative Humidity 25°C±3°C -25°C~+85°C 5~40°C 20~70% Too much solderCracks tend to occur due to large stress. Not enough solder Weak holding forcemay cause bad connection between the capacitor and PCB. Recommended Soldering amounts The optimal solder fillet amounts for re-flow soldering 天线厚度 以下 The optimal solder fillet amounts for wave soldering P/N: SURL160808 SRF08 Temperature Cycle Test 10±1S Applied Force: 5NDuration: 10±1S Preheating conditions: up-category temperature, 1h Recovery time: 24±1h Initial Measurement Cycling Times: 5 times, 1 cycle, 4 steps: www.surbaner.com.cn SBR Communication has possession of proprietary information provided in this report and this proprietary information shall be kept in strict confidence and not disclosed to any person or firm without the prior written consent of SBR Communication Technology. . Page 7 Resistanceto SolderingHeat Preheating80 to 120°C; 10~30s.SolderTemperature:235±5°C Duration:2±0.5s，SolderTemperature:245±5°C Duration:2±0.5s，Preheating100to200°C;10±2min. Solder Temperature: 265±5°C Duration: 10±1s Clean the capacitor with solvent and examine it with a 10X(min.) microscope. Recovery Time: 24±2h Recovery condition: Room temperature Resistance to Flexure of Substrate Test Board: Al 2 O 3 or PCBWarp: 1mm Speed: 0.5mm/sec. Unit: mm The measurement should be made with the board in the bending position. P/N: SURL160808 SRF08 www.surbaner.com.cn SBR Communication has possession of proprietary information provided in this report and this proprietary information shall be kept in strict confidence and not disclosed to any person or firm without the prior written consent of SBR Communication Technology. . Page 8 While in preheating,please keep the temperature difference between soldering temperature and surface temperature of chips as: T≤150°C. P/N: SURL160808 SRF08 Dimensions of paper taping for 0603types Reel（4000 pcs/Reel） Storage Period The guaranteed period for solderability is 6 months(Under deliver package condition).Temperature5~40°C /Relative Humidity20~70% www.surbaner.com.cn SBR Communication has possession of proprietary information provided in this report and this proprietary information shall be kept in strict confidence and not disclosed to any person or firm without the prior written consent of SBR Communication Technology. . Page 9 P/N: SURL160808 SRF08 Unit：mm

Page 1 of 70 FCC Test Report Report No.: AGC01082230502FE03 FCC ID : 2AIXN-NC4 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : TWS Bluetooth Headset BRAND NAME : N/A MODEL NAME : BS377Z2E-1, NC4, NC4pro, NC4plus, BS377Z2E-2, BS377Z2E-3, BS377Z2E-4, BS377Z2E-5, BS377Z2E-6, BS377Z2E-7, BS377Z2E-8, BS377Z2E-9 APPLICANT : GuangZhou U&I Technology Company Limited DATE OF ISSUE : May 30, 2023 STANDARD(S) : FCC Part 15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC01082230502FE03 Page 2 of 70 REPORT REVISE RECORD Report Version Revise Time Issued Date Valid Version Notes V1.0 / May 30, 2023 Valid Initial Release Report No.: AGC01082230502FE03 Page 3 of 70 TABLE OF CONTENTS 1. VERIFICATION OF CONFORMITY .................................................................................................................. 5 2. GENERAL INFORMATION .............................................................................................................................. 6 2.1. PRODUCT DESCRIPTION ........................................................................................................................ 6 2.2. TABLE OF CARRIER FREQUENCYS ....................................................................................................... 6 2.3. RECEIVER INPUT BANDWIDTH .............................................................................................................. 7 2.4. EXAMPLE OF A HOPPING SEQUENCY IN DATA MODE ......................................................................... 7 2.5. EQUALLY AVERAGE USE OF FREQUENCIES AND BEHAVIOUR ......................................................... 7 2.6. RELATED SUBMITTAL(S) / GRANT (S) .................................................................................................... 8 2.7. TEST METHODOLOGY ............................................................................................................................. 8 2.8. SPECIAL ACCESSORIES ......................................................................................................................... 8 2.9. EQUIPMENT MODIFICATIONS ................................................................................................................. 8 2.10. ANTENNA REQUIREMENT..................................................................................................................... 8 3. MEASUREMENT UNCERTAINTY ................................................................................................................... 9 4. DESCRIPTION OF TEST MODES ................................................................................................................. 10 5. SYSTEM TEST CONFIGURATION ................................................................................................................ 11 5.1. CONFIGURATION OF EUT SYSTEM ...................................................................................................... 11 5.2. EQUIPMENT USED IN TESTED SYSTEM .............................................................................................. 11 5.3. SUMMARY OF TEST RESULTS .............................................................................................................. 11 6. TEST FACILITY .............................................................................................................................................. 12 7. PEAK OUTPUT POWER ................................................................................................................................ 13 7.1. MEASUREMENT PROCEDURE ............................................................................................................. 13 7.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) .................................................................... 13 7.3. LIMITS AND MEASUREMENT RESULT .................................................................................................. 14 8. 20DB BANDWIDTH ........................................................................................................................................ 24 8.1. MEASUREMENT PROCEDURE ............................................................................................................. 24 8.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) .................................................................... 24 8.3. LIMITS AND MEASUREMENT RESULTS ............................................................................................... 25 9. CONDUCTED SPURIOUS EMISSION........................................................................................................... 30 9.1. MEASUREMENT PROCEDURE ............................................................................................................. 30 Report No.: AGC01082230502FE03 Page 4 of 70 9.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) .................................................................... 30 9.3. MEASUREMENT EQUIPMENT USED .................................................................................................... 30 9.4. LIMITS AND MEASUREMENT RESULT .................................................................................................. 30 10. RADIATED EMISSION ................................................................................................................................. 51 10.1. MEASUREMENT PROCEDURE ........................................................................................................... 51 10.2. TEST SETUP ......................................................................................................................................... 53 10.3. LIMITS AND MEASUR…

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