2A74QAPA-3500BTAMPLIFIER

With Wireless Music Stream Function With MS/MC, Digital VFD Display Wireless music stream audio input MS/MC input (Audio / Video play) 200 150 - 2 Digital Video Inputs and 1 Output 3. AUX Input 4. MS/MC input port 5. MS/MC/Wireless Music Stream mode: reverse, play/pause, forward 1. Power ON/OFF 2. FM/AM selector 3. Radio frequency selection (e.g: 87.5, 87.6, 87.7...etc ), press to save stations 4. Automatically searches for radio stations 5. Sound effect selection 6. Menu function setting to enter and adjustment 7. Volume adjustment 8. LED display brightness adjustment 9. Numeric straight selection key 10. Mute 11. Reverse, play/pause, forward FM/AM mode: CH-, SEARCH, CH+ 12. Input selector 13. Speaker output A, B selector 14. Equal loudness switch 15. Single song repeat / Play list repeat 16. Numeric error reset key Set the INPUT selector knob switch to BT/MP3/AUX. Insert your MS/MC flash memory to the MS/MC port of the product. It will automatically plays audio/video files stored in your flash memory. Front panel functi on button for operate MS/MC play function. Set the INPUT selector switch to BT/MP3/AUX. Press the button select BT mode (VFD screen will display). Enable the wireless music stream function of your external gadget and search the wireless music stream ID of the product (APA5000BT) then connect. Once connected, you can play audio files in your external gadget and listen the music to the hi-quality audio output of the product. You can use the audio playback control ( ) of the product during wireless music stream operation depending on your gadget. MS / MC Operation (Front panel) Wireless Music Stream Operation (Front panel) Wireless Music Stream Input The Music Center features a wireless music stream input so you can connect your smartphone, tablet, or PC/Mac computer. Whenever your wireless music stream source allows for it, a wireless music stream aptX link will be established to give you high performance audio quality (¼ jack) MS / MC and MP3 You can plug in a MS key / MC card on the MS / MC plug located on the side. Connect with an active subwoofer enclosure. guarantees the APA series amplifiers to be free from defective material and/or workmanship for a period of one year from the date of sale,and will replace defective parts and repair malfunctioning products under this warranty when the defect occurs under normal installation and use provided the unit is returned to the Audiopipe after requesting an RMA and troubleshooting procedures have been confirmed. This warranty provides that examination of the returned product must indicate,in our judgment,a manufacturing defect. This warranty does not extend to any product which has been subjected to misuse,neglect accident,improper installation,or where the date code has been removed or defaced. FCC Warning Statement Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. 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.

< Okura U.S.A., Inc. > Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD21046 Date: Nov. 11, 2022 Subject; Request for Long Term Confidentiality FCC ID: 2A74QAPA-3500BT To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: Gonzi Palenzuela Title: Manager

Okura U.S.A., Inc. Letter of Authorization Company: Okura U.S.A., Inc. Address: 1195 N.W. 97th Ave. Doral, FL 33172, United States Product name: AMPLIFIER Trade name: AudioPipe Model name: APA-3500BT, APA-5000BT FCC Identifier: 2A74QAPA-3500BT We authorize MiCOM LabsInc, 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the above named equipment. Any individual within MiCOM Labs is authorized to act on our behalf and take action on the application. We declare that MiCOM LabsInc, 575 Boulder Court, Pleasanton, California 94566, USA, is allowed to forward all information related to the approval project to the Federal Communication Commission 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. Name: Gonzi Palenzuela Date: Nov. 11, 2022 Title: Manager Signature of applicant:

Model Difference Declaration To Whom It May Concern, We, Okura U.S.A., Inc. Product name: AMPLIFIER Trade name: AudioPipe Model name: APA-3500BT, APA-5000BT All model’s the function, software and electric circuit are the same, only with a product color and model named different. Test sample model: APA-3500BT. Please contact me if you have any question. Name: Gonzi Palenzuela Date: Nov. 11, 2022 Title: Manager Signature of applicant:

Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT

FCC ID LABEL: Label Location: FCC ID: 2A74QAPA-3500BT Product Name: AMPLIFIER Model Name: APA-3500BT 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. Long: 3cm Width: 2cm

Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT Model: APA-3500BT PCB Antenna

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Page 1 of 38 Report No.: UNIA22061008ER-61 FCC RADIO TEST REPORT FCC ID: 2A74QAPA-3500BT Sample： AMPLIFIER Trade Name： AudioPipe Main Model： APA-3500BT Additional Model： APA-5000BT Report No.： UNIA22061008ER-61 Prepared for Okura U.S.A., Inc. 1195 N.W. 97th Ave. Doral, FL 33172, United States Prepared by Shenzhen United Testing Technology Co., Ltd. 2F, Annex Bldg, Jiahuangyuan Tech Park, #365 Baotian 1 Rd, Tiegang Community, Xixiang Str, Bao'an District, Shenzhen, China Page 2 of 38 Report No.: UNIA22061008ER-61 TEST RESULT CERTIFICATION Applicant .............................. : Okura U.S.A., Inc. Address ................................. : 1195 N.W. 97th Ave. Doral, FL 33172, United States Manufacturer ........................ : FOSHAN TRANSOUND CO.,LTD Address ................................. : NO.18, Chuangxin Dong Road, Sanshui District, Foshan, Guangdong, China Product description Product ....................................... : AMPLIFIER Trade Name ........................... : AudioPipe Model Name .......................... : APA-3500BT, APA-5000BT Test Methods ........................ : FCC Rules and Regulations Part 15 Subpart C Section 15.249, ANSI C63.10: 2013 This device described above has been tested by Shenzhen United Testing Technology Co., Ltd., and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of UNI, this document may be altered or revised by Shenzhen United Testing Technology Co., Ltd., personnel only, and shall be noted in the revision of the document. Date of Test ........................................... : Date (s) of performance of tests ............. : Jun. 10, 2022 ~ Jul. 28, 2022 Date of Issue .......................................... : Nov. 11, 2022 Test Result .............................................. : Pass Prepared by: Kahn yang/Supervisor Reviewer: Kelly Cheng/Supervisor Approved & Authorized Signer: Liuze/Manager Page 3 of 38 Report No.: UNIA22061008ER-61 Table of Contents Page 1 TEST SUMMARY 4 2 GENERAL INFORMATION 7 2.1 GENERAL DESCRIPTION OF EUT 7 2.2 CARRIER FREQUENCY OF CHANNELS 8 2.3 TEST MODE 9 2.4 TEST SETUP 9 2.5 DESCRIPTION TEST PERIPHERAL AND EUT PERIPHERAL 10 2.6 MEASUREMENT INSTRUMENTS LIST 11 3 CONDUCTED EMISSION 12 3.1 TEST LIMIT 12 3.2 TEST SETUP 12 3.3 TEST PROCEDURE 13 3.4 TEST RESULT 13 4 RADIATED EMISSION 16 4.1 TEST LIMIT 16 4.2 TEST SETUP 17 4.3 TEST PROCEDURE 18 4.4 TEST RESULT 18 5 BAND EDGE 28 5.1 TEST LIMIT 28 5.2 TEST PROCEDURE 28 5.3 TEST RESULT 28 6 OCCUPIED BANDWIDTH 31 6.1 TEST SETUP 31 6.2 TEST PROCEDURE 31 6.4 TEST RESULT 31 7 ANTENNA REQUIREMENT 36 8 PHOTO OF TEST 37 8.1 RADIATED EMISSION 37 8.2 CONDUCTED EMISSION 38 Page 4 of 38 Report No.: UNIA22061008ER-61 1 TEST SUMMARY 1.1 TEST PROCEDURES AND RESULTS ITEM STANGARD RESULT CONDUCTED EMISSION FCC Part 15.207 COMPLIANT RADIATED EMISSION FCC Part 15.209/15.249 COMPLIANT BAND EDGE FCC Part 15.249/15.205 COMPLIANT OCCUPIED BANDWIDTH FCC Part 15.215 COMPLIANT ANTENNA REQUIREMENT FCC Part 15.203 COMPLIANT Page 5 of 38 Report No.: UNIA22061008ER-61 1.2 TEST FACILITY Test Firm : Shenzhen United Testing Technology Co., Ltd. Address : 2F, Annex Bldg, Jiahuangyuan Tech Park, #365 Baotian 1 Rd, Tiegang Community, Xixiang Str, Bao'an District, Shenzhen, China The testing quality ability of our laboratory meet with "Quality Law of People's Republic of China" Clause 19.The testing quality system of our laboratory meets with ISO/IEC-17025 requirements. This approval result is accepted by MRA of APLAC. Our test facility is recognized, certified, or accredited by the following organizations: A2LA Certificate Number: 4747.01 The EMC Laboratory has been accredited by A2LA, and in compliance with ISO/IEC 17025:2017 General Requirements for testing Laboratories. FCC Registration Number: 674885 The EMC Laboratory has been registered and fully described in a report filed with the (FCC) Federal Communications commission. IC Registration Number: 21947 The EMC Laboratory has been registered and fully described in a report filed with the (IC) Industry Canada. Page 6 of 38 Report No.: UNIA22061008ER-61 1.3 MEASUREMENT UNCERTAINTY The reported uncertainty of measurement y ± U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2, providing a level of confidence of approximately 95 %. A. Conducted Measurement: Test Site Method Measurement Frequency Range U, (dB) NOTE UNI ANSI 9kHz ~ 150kHz 2.96 150kHz ~ 30MHz 2.44 B. Radiated Measurement: Test Site Method Measurement Frequency Range U, (dB) NOTE UNI ANSI 9kHz ~ 30MHz 2.50 30MHz ~ 1000MHz 4.80 Above 1000MHz 4.13 Page 7 of 38 Report No.: UNIA22061008ER-61 2 GENERAL INFORMATION 2.1 GENERAL DESCRIPTION OF EUT Product: AMPLIFIER Trade Name: AudioPipe Main Model: APA-3500BT Additional Model: APA-5000BT Model Difference: All model’s the function, software and electric circuit are the same, only with a product color and model named different. Test sample model: APA-3500BT. FCC ID: 2A74QAPA-3500BT Operation Frequency: 2402MHz~2480MHz Number of Channels: 79CH Modulation Type: π/4 DQPSK, 8DPSK Antenna Type: PCB Antenna Antenna Gain: 2dBi Battery: N/A Adapter: N/A Power Source: AC 120(240)V/60Hz Page 8 of 38 Report No.: UNIA22061008ER-61 2.2 CARRIER FREQUENCY OF CHANNELS Channel List Channel Frequency (MHz) Channel Frequency (MHz) Channel Frequency (MHz) Channel Frequency (MHz) 00 2402 21 2423 42 2444 63 2465 01 2403 22 2424 43 2445 64 2466 02 2404 23 2425 44 2446 65 2467 03 2405 24 2426 45 2447 66 2468 04 2406 25 2427 46 2448 67 2469 05 2407 26 2428 47 2449 68 2470 06 2408 27 2429 48 2450 69 2471 07 2409 28 2430 49 2451 70 2472 08 2410 29 2431 50 2452 71 2473 09 2411 30 2432 51 2453 72 2474 10 2412 31 2433 52 2454 73 2475 11 2413 32 2434 53 2455 74 2476 12 2414 33 2435 54 2456 75 2477 13 2415 34…

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Model: APA-3500BT Radiated Emission test Model: APA-3500BT Conducted Emission test