2BBZ8XY-S350HBluetooth audio power amplifier board

User Manual Parameters Product name Bluetooth audio amplifier board Product Model XY-S350H Power supply DC12-38V/10A Bluetooth version 5.0 Audio Channel 2.1 Audio Input Bluetooth + AUX + USB flash drive Frequency 20Hz-20KHz Functions of master volume knob Turn Clockwise Increase volume Turn Counterclockwise Decrease volume Click Play / Pause Long press to 2S Power OFF / Power ON How to using the product Play by Bluetooth 1. It will start work, after power on. 2. Blue led will flash quickly, then turn on your phone Bluetooth setting and search device 3. It will show a device named XinYi in your phone and pair it (no need PIN NO.) 4. Open the music player in your phone to play music Play by USB flash drive 1. Make sure that USB flash drive works in FAT32 file system, and copy music into it 2. Power on the amplifier board 3. Plug USB flash drive into USB connector after power on, it will play music in USB automatically Play by AUX 1. Power on the amplifier board 2. Plug one end of AUX wire into your player connector 3. Then plug another end of AUX wire into amplifier board connector, it will play automatically NOTE: It starts work automatically after power on, with no operation Output power Channel Output Power(max) R and L Channel Deliver 2×10W into a 8-Ω speaker at 12V Deliver 2×20W into a 4-Ω speaker at 12V Deliver 2×25W into a 3-Ω speaker at 12V Subwoofer Deliver 10W into a 8-Ω speaker at 12V Deliver 20W into a 4-Ω speaker at 12V Deliver 25W into a 3-Ω speaker at 12V Deliver 35W into a 2-Ω speaker at 12V R and L Channel Deliver 2×30W into a 8-Ω speaker at 24V Deliver 2×70W into a 4-Ω speaker at 24V Deliver 2×100W into a 3-Ω speaker at 24V Subwoofer Deliver 30W into a 8-Ω speaker at 24V Deliver 70W into a 4-Ω speaker at 24V Deliver 100W into a 3-Ω speaker at 24V Deliver 150W into a 2-Ω speaker at 24V R and L Channel Deliver 2×80W into a 8-Ω speaker at 36V Deliver 2×160W into a 4-Ω speaker at 36V Deliver 2×220W into a 3-Ω speaker at 36V Subwoofer Deliver 80W into a 8-Ω speaker at 36V Deliver 160W into a 4-Ω speaker at 36V Deliver 220W into a 3-Ω speaker at 36V Deliver 350W into a 2-Ω speaker at 36V Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the 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. 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. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction

(Qingdao Xinyiyunlian Electronic Technology Co.LTD) (July 11, 2023) 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: 2BBZ8XY-S350H) [Qingdao Xinyiyunlian Electronic Technology Co.LTD] (“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. Sincerely, (Applicant signature) (Applicant printed name) deliang zhang (Qingdao Xinyiyunlian Electronic Technology Co.LTD) (July 11, 2023) 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: 2BBZ8XY-S350H) [Qingdao Xinyiyunlian Electronic Technology Co.LTD] (“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) (Applicant printed name) deliang zhang

Qingdao Xinyiyunlian Electronic Technology Co.LTD (July 11, 2023) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology Co., Ltd.) to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Signature: Name: deliang zhang Title: R&D Manger

Qingdao Xinyiyunlian Electronic Technology Co.LTD Model Difference Data：July 19, 2023 Product description: Bluetooth audio power amplifier board Model name: XY-S350H, XY-S220H, XY-S100H, XY-S100L, XY-S600H, XY- T220H, XY-T160H, XY-T100H,XY-T100L, XY-T50H, XY-T50L, XY-T30H, XY- T30L, XY-T15H,XY-E100H, XY-E100L, XY-E30H, XY-Y100H, XY-Y100L, XY- Y50H, XY-Y50L, XY-Y30H, XY-Y30L, XY-Y15H, XY-Y5W, XY-C160H, XY- C220H, XY-C100H, XY-C100L, XY-C50H, XY-C50L, XY-C15H, XY-AP100H, XY-AP100L, XY-AP50H, XY-AP50L, XY-AP15H, XY-P15W, XY-P40W, XY- X15H, XY-X30L, XY-X30H, XY-X50L, XY-X50H, XY-K15H, XY-K50L, XY-K50H, S350HS, S220HS, S100HS, T220HS, T160HS, T100HS, T50HS, C220HS, C160HS, C50HS, XY-1002, XY-W100L, XY-W50H, XY-W50L, XY-WBT, XY- BDT, XY-WRBT, XY-P5W, XY-ABT, XY-SBT, XY-BT5W, XY-BT-Mini Trade Name: XINYI SINI AUDIO FCC ID: 2BBZ8XY-S350H All the model are the same circuit and RF module, except model names . Regards Sincerely Client’s signature : Client’s name / title : deliang zhang（R&D Manger） Contact information / address：Room 1008, Unit 1, No. 658, Jiangshan South Road, Huangdao District, Qingdao City, Shandong Province

Qingdao Xinyiyunlian Electronic Technology Co.LTD (July 19, 2023) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Bluetooth audio power amplifier board / XY-S350H, XY-S220H, XY-S100H, XY-S100L, XY-S600H, XY-T220H, XY- T160H, XY-T100H,XY-T100L, XY-T50H, XY-T50L, XY-T30H, XY-T30L, XY- T15H,XY-E100H, XY-E100L, XY-E30H, XY-Y100H, XY-Y100L, XY-Y50H, XY- Y50L, XY-Y30H, XY-Y30L, XY-Y15H, XY-Y5W, XY-C160H, XY-C220H, XY- C100H, XY-C100L, XY-C50H, XY-C50L, XY-C15H, XY-AP100H, XY-AP100L, XY-AP50H, XY-AP50L, XY-AP15H, XY-P15W, XY-P40W, XY-X15H, XY-X30L, XY-X30H, XY-X50L, XY-X50H, XY-K15H, XY-K50L, XY-K50H, S350HS, S220HS, S100HS, T220HS, T160HS, T100HS, T50HS, C220HS, C160HS, C50HS, XY-1002, XY-W100L, XY-W50H, XY-W50L, XY-WBT, XY-BDT, XY- WRBT, XY-P5W, XY-ABT, XY-SBT, XY-BT5W, XY-BT-Mini / FCC ID: 2BBZ8XY- S350H) To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☒ Internal Photos ☐ NOTE 1 ☒ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No required to be submitted with this application be permanently withheld from public review. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Signature: Name: deliang zhang Title: R&D Manger

External Photos

FCC ID LABEL: Label Location: FCC ID: 2BBZ8XY-S350H Model No.: XY-S350H 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.

Internal Photos ANT

Shenzhen CTB Testing Co., Ltd. FCC ID:2BBZ8XY-S350H Portable device According to §15.247(e)(i) and §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. According to KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR 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)]·[√f(GHZ)] ≤ 3.0 for 1-g SAR and ≤ 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 When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. EDR: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 -0.795 0.83 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 -1.811 0.66 -1±1 0.00 1.00 <5 0.31247 3.00 YES 2.480 -1.184 0.76 -1±1 0.00 1.00 <5 0.31496 3.00 YES 2.402 -0.091 0.98 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 -1.144 0.77 -1±1 0.00 1.00 <5 0.31247 3.00 YES 2.480 -0.566 0.88 0±1 1.00 1.26 <5 0.39651 3.00 YES GFSK π /4DQPSK Conclusion: For the max result : 0.39651≤ FCC Limit 3.0 for 1g SAR.

Inverted F Antenna Specification Summary ITEMANT SPEC Model Name 2.4G ANT HorizontalVertical 2400MHz 2400MHz2500MHz2400MHz2400MHz 2500MHz Center Frequency -1.26-0.76-0.58-5.25-2.46-1.86 MAX. Gain -0.58dB PolarizationHorizontal and Vertical Azimuth Beam Pattern Omni-directional Impedance50 Ohm Antenna Length 38.20mm Manufacture ZHUHAI JIELI TECHNOLOGY CO.,LTD Antenna Photo & Length (mm) Horizontal: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -40 Scale: 5/div Gain(dB) Frequency (MHz) Max Min Avg 2400 -1.26174 -30.0801 -7.18716 2450 -0.765802 -36.5604 -7.48023 2500 -0.585582 -22.0315 -6.59127 Vertical: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -30 Scale: 5/div Gain(dB) Frequency (MHz) Max Min Avg 2400 -5.2537 -22.1424 -12.4294 2450 -2.4652 -24.5837 -10.4702 2500 -1.86120 -29.5214 -9.20432 ANT Test Labs：Attestation of Global Compliance Co., Ltd.

Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB230707030RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 52 TEST REPORT Compiled by: Reviewed by: Approved by: Chen Zheng Arron Liu Bin Mei / Director Note: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: Bluetooth audio power amplifier board FCC ID: 2BBZ8XY-S350H Trademark: XINYI SINI AUDIO Model Number: XY-S350H, See the next page for other models. Prepared For: Qingdao Xinyiyunlian Electronic Technology Co.LTD Address: Room 1008, Unit 1, No. 658, Jiangshan South Road, Huangdao District, Qingdao City, Shandong Province Manufacturer: Qingdao Xinyiyunlian Electronic Technology Co.LTD Address: Room 1008, Unit 1, No. 658, Jiangshan South Road, Huangdao District, Qingdao City, Shandong Province Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Jun. 28, 2023 Sample tested Date: Jun. 28, 2023 to Jul. 07, 2023 Issue Date: Jul. 07, 2023 Report No.: CTB230707030RFX Test Standards FCC Part15.247 ANSI C63.10:2013 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB230707030RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 52 Other models: XY-S220H, XY-S100H, XY-S100L, XY-S600H, XY-T220H, XY-T 160H, XY-T100H,XY-T100L, XY-T50H, XY-T50L, XY-T30H, XY-T30L, XY-T15H,XY-E100H, XY-E100L, XY-E30H, XY-Y100H, XY-Y100L, XY-Y50H, XY-Y50L, XY-Y30H, XY-Y30L, XY-Y15H, XY-Y5W, XY-C160H, XY-C220H, XY-C100H, XY-C100L, XY-C50H, XY-C50L, XY-C15H, XY-AP100H, XY-AP100L, XY-AP50H, XY-AP50L, XY-AP15H, XY-P15W, XY-P40W, XY-X15H, XY-X30L, XY-X30H, XY-X50L, XY-X50H, XY-K15H, XY-K50L, XY-K50H, S350HS, S220HS, S100HS, T220HS, T160HS, T100HS, T50HS, C220HS, C160HS, C50HS, XY-1002, XY-W100L, XY-W50H, XY-W50L, XY-WBT, XY-BDT, XY-WRBT, XY-P5W, XY-ABT, XY-SBT, XY-BT5W, XY-BT-Mini Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB230707030RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 52 TABLE OF CONTENT Test Report Declaration Page 1. VERSION .......................................................................... 5 2. TEST SUMMARY ................................................................... 6 3. MEASUREMENT UNCERTAINTY ..................................................... 7 4. PRODUCT INFORMATION AND TEST SETUP .......................................... 8 4.1 Product Information .................................................................... 8 4.2 Test Setup Configuration ............................................................... 8 4.3 Support Equipment .................................................................... 8 4.4 Channel List .......................................................................... 9 4.5 Test Mode ............................................................................ 9 4.6 Test Environment ...................................................................... 9 5. TEST FACILITY AND TEST INSTRUMENT USED ...................................... 10 5.1 Test Facility .......................................................................... 10 5.2 Test Instrument Used ................................................................. 10 6. AC POWER LINE CONDUCTED EMISSION ............................................ 12 6.1 Block Diagram Of Test Setup .......................................................... 12 6.2 Limit ................................................................................ 12 6.3 Test procedure ....................................................................... 12 6.4 Test Result .......................................................................... 14 7. RADIATED SPURIOUS EMISSION ................................................... 15 7.1 Block Diagram Of Test Setup .......................................................... 15 7.2 Limit ................................................................................ 15 7.3 Test procedure ....................................................................... 16 7.4 Test Result .......................................................................... 17 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS .......................... 26 8.1 Block Diagram Of Test Setup .......................................................... 26 8.2 Limit ................................................................................ 26 8.3 Test procedure ....................................................................... 26 8.4 Test Result .......................................................................... 27 9. COUDUCTED PEAK OUTPUT POWER ............................................... 32 9.1 Block Diagram Of Test Setup .......................................................... 32 9.2 Limit ................................................................................ 32 9.3 Test procedure ....................................................................... 32 9.4 Test Result .......................................................................... 33 10. 20DB OCCUPIED BANDWIDTH...................................................... 36 10.1 Block Diagram Of Test Setup ......................................................... 36 10.2 Limit .......................................…

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Radiated Emission Below 1G Above 1G