2A3NOTR639Vintage Turntable

The maximum RF Output Power -2.01dBm (for EU) This Class B digital apparatus complies with Canadian ICES-003 Use the device in the environment with the temperature between 0-40 ,otherwise,it may damage your deivce. It can be operating under 2000. ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD ROOM 709,SANJIANG BUILDING,NO.170 NANYANG ROAD,HUIJI DISTRICT, ZHENGZHOU HENAN CHINA FCC RF Exposure Warning Statements: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment shall be installed and operated with minimum distance 20cm between the radiator & body.

ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. An expiration date for this letter does not exist. In case the U.S. agent changes, the grantee is obligated to notify the FCC within 30 days via the granting TCB. Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 12/22/2023 U.S. Agent Designation [ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD.] acknowledges their consent for the following contact located in the United States to act as their agent for service of proc ess for the equipment for which authorization is sought (FCC ID: [2A3NOTR639]): Contact: Liuye Li Company U.S. agent: RETEVIS INC Physical U.S. address of agent: 1733 E BROOKPORT ST, COVINA, CA 91724 FRN of U.S. agent: 0033657701 Email address of U.S. agent: [email protected] Phone of U.S. agent: 626-362- 2594 [U.S. agent] acknowledges their obligation to accept service of process on behalf of [ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD.]. [ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD.] with the FRN [0031620636] accepts its obligation to maintain an agent for service of process in the United States for no less than one year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later . By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(d)(7) . Sincerely, [Dongfang Shen] [Deputy] [ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD .] 48_[mo del] US_Agent _2.911(d)(7) - U, V04 ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. An expiration date for this letter does not exist. In case the U.S. agent changes, the grantee is obligated to notify the FCC within 30 days via the granting TCB. [Liuye Li] [Manager] [RETEVIS INC]

ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD ROOM 709, SANJIANG BUILDING, NO.170 NANYANG ROAD, HUIJI DISTRICT, ZHENGZHOU HENAN CHINA Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 12-22-2023 Ref: Attestation Statements Part 2.911(d)(5)(i) Filing FCC ID: 2A3NOTR639 [ZHENGZHOU YSAIR 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) (Weidong Shen) ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD ROOM 709, SANJIANG BUILDING, NO.170 NANYANG ROAD, HUIJI DISTRICT, ZHENGZHOU HENAN CHINA Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 12-22-2023 Ref: Attestation Statements Part 2.911(d)(5)(ii) Filing FCC ID: 2A3NOTR639 [ZHENGZHOU YSAIR 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) (Weidong Shen)

ANTENNASPECIFICATION Summary ITEMANTSPEC ModelName2.4GANT AntennaplatePCBantenna Center Frequency HorizontalVertical 2400MHz2450MHz2500MHz2400MHz2450MHz2500MHz -1.66-0.840-6.16-3.65-2.21 MAX.Gain0 PolarizationHorizontalandVertical Impedance50Ohm ManufactureSHENZHENSHIXINZHONGXINTECHNOLOGY . CO ., LTD AntennaPhoto&Length(mm) Block A3, Dong Huan Industrial Zone, Nanpu Road, Shajin Street, Baoan District,Shenzhen,China. Horizontal:2400MHz2450MHz2500MHz Power(dBm) Max:0Min:-40Scale:5/div FrequencyGain(dBi) (MHz)Max.MinAvg. 2400-1.66179-30.2813-8.78713 2450-0.847811-38.7595-7.87812 2500-0.000000-23.6329-6.99139 Vertical:2400MHz2450MHz2500MHz Power(dBm) Max:0Min:-30Scale:5/div FrequencyGain(dBi) (MHz)Max.MinAvg. 2400-6.1623-23.1425-12.5295 2450-3.6534-26.2866-10.6699 2500-2.21101-29.4381-9.58526

ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD ROOM 709, SANJIANG BUILDING, NO.170 NANYANG ROAD, HUIJI DISTRICT, ZHENGZHOU HENAN CHINA Date：12-22-2023 Product Model Number: TR639 FCC ID：2A3NOTR639 To whom it may concern, Re: Product Certification Representative Authorization Letter We authorize QAI Laboratories Ltd. 3980 North Fraser Way, Burnaby B.C. Canada V5J 5K5 to act on our behalf on all matters concerning the above named equipment. This shall include the following:  Testing  Approval applications and procedures We declare that ORGANIZATION. is allowed to forward all information related to the approval project to the applied certification body and to the notification entities and to discuss any issues concerning the approval application. Any and all acts carried out by ORGANIZATION. on our behalf shall have the same effect as acts of our own. By: Weidong Shen Contact Listed on FCC Wesbite Title: General Manager Email: [email protected] Telephone: 63262209 On behalf of: ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD

ZHENGZHOU YSAIR TECHNOLOGY CO.,LTD ROOM 709, SANJIANG BUILDING, NO.170 NANYANG ROAD, HUIJI DISTRICT, ZHENGZHOU HENAN CHINA Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2023-12-22 Subject; Request for Confidentiality FCC ID: 2A3NOTR639 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 In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. 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 Contact person: Weidong Shen

Report No.: AGC13459231201AP03 Page 1 of 4 EXTERNAL PHOTOS WHOLE VIEW OF EUT ADAPTER VIEW OF EUT Report No.: AGC13459231201AP03 Page 2 of 4 TOP VIEW OF EUT BOTTOM VIEW OF EUT Report No.: AGC13459231201AP03 Page 3 of 4 FRONT VIEW OF EUT BACK VIEW OF EUT Report No.: AGC13459231201AP03 Page 4 of 4 LEFT VIEW OF EUT RIGHT VIEW OF EUT ****************************************End of Report*************************************

FCC ID Label Location 40mm&40mm FCC ID: 2A3NOTR639

Report No.: AGC13459231201AP03 Page 1 of 4 INTERNAL PHOTOS VIEW OF EUT(PORT) OPEN VIEW OF EUT Report No.: AGC13459231201AP03 Page 2 of 4 INTERNAL VIEW OF EUT (FIGURE 1) INTERNAL VIEW OF EUT (FIGURE 2) Report No.: AGC13459231201AP03 Page 3 of 4 INTERNAL VIEW OF EUT (FIGURE 3) INTERNAL VIEW OF EUT (FIGURE 4) BT Antenna Report No.: AGC13459231201AP03 Page 4 of 4 INTERNAL VIEW OF EUT (FIGURE 5) ****************************************End of Report*************************************

Page 1 of 76 FCC Test Report Report No.: AGC13459231201FR01 FCC ID : 2A3NOTR639 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Vintage Turntable BRAND NAME : RETEKESS MODEL NAME : TR639 APPLICANT : ZHENGZHOU YSAIR TECHNOLOGY CO., LTD DATE OF ISSUE : Jan. 03, 2024 STANDARD(S) : FCC Part 15 Subpart C §15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC13459231201FR01 Page 2 of 76 Report Revise Record Report Version Revise Time Issued Date Valid Version Notes V1.0 / Jan. 03, 2024 Valid Initial Release Report No.: AGC13459231201FR01 Page 3 of 76 Table of Contents 1. General Information ........................................................................................................................................ 5 2. Product Information ........................................................................................................................................ 6 2.1 Product Technical Description ................................................................................................................... 6 2.2 Test Frequency List ................................................................................................................................... 6 2.3 Related Submittal(S) / Grant (S) ............................................................................................................... 7 2.4 Test Methodology ...................................................................................................................................... 7 2.5 Receiver Input Bandwidth ......................................................................................................................... 7 2.6 Equally Average Use of Frequencies And Behaviour ............................................................................... 7 2.7 Pseudorandom Frequency Hopping Sequence ........................................................................................ 8 2.8 Special Accessories .................................................................................................................................. 9 2.9 Equipment Modifications ........................................................................................................................... 9 2.10 Antenna Requirement ............................................................................................................................. 9 3. Test Environment .......................................................................................................................................... 10 3.1 Address of The Test Laboratory .............................................................................................................. 10 3.2 Test Facility .............................................................................................................................................. 10 3.3 Environmental Conditions ....................................................................................................................... 11 3.4 Measurement Uncertainty ....................................................................................................................... 11 3.5 List of Equipment Used ........................................................................................................................... 12 4.System Test Configuration ............................................................................................................................ 14 4.1 EUT Configuration ................................................................................................................................... 14 4.2 EUT Exercise ........................................................................................................................................... 14 4.3 Configuration of Tested System .............................................................................................................. 14 4.4 Equipment Used in Tested System ......................................................................................................... 14 4.5 Summary of Test Results ........................................................................................................................ 15 5. Description of Test Modes ........................................................................................................................... 16 6. RF Output Power Measurement .................................................................................................................. 17 6.1 Provisions Applicable .............................................................................................................................. 17 6.2 Measurement Procedure ......................................................................................................................... 17 6.3 Measurement Setup (Block Diagram of Configuration) .......................................................................... 17 6.4 Measurement Result ............................................................................................................................... 18 7. 20dB Bandwidth and 99% Occupied Bandwidth Measurement ............................................................... 24 7.1 Provisions Applicable .............................................................................................................................. 24 7.2 Measurement Procedure ......................................................................................................................... 24 7.3 Measurement Setup (Block Diagram of Configuration) .......................................................................... 24 7.4 Measurement Results ............................................................................................................................. 25 8. Conducted Band Edge and Out-of-Band Emissions ..........................…

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Page 1 of 84 FCC Test Report Report No.: AGC13459231201FR01 FCC ID : 2A3NOTR639 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Vintage Turntable BRAND NAME : RETEKESS MODEL NAME : TR639 APPLICANT : ZHENGZHOU YSAIR TECHNOLOGY CO., LTD DATE OF ISSUE : Jan. 10, 2024 STANDARD(S) : FCC Part 15 Subpart C §15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC13459231201FR01 Page 2 of 84 Report Revise Record Report Version Revise Time Issued Date Valid Version Notes V1.0 / Jan. 10, 2024 Valid Initial Release Report No.: AGC13459231201FR01 Page 3 of 84 Table of Contents 1. General Information ........................................................................................................................................ 5 2. Product Information ........................................................................................................................................ 6 2.1 Product Technical Description ................................................................................................................... 6 2.2 Test Frequency List ................................................................................................................................... 6 2.3 Related Submittal(S) / Grant (S) ............................................................................................................... 7 2.4 Test Methodology ...................................................................................................................................... 7 2.5 Receiver Input Bandwidth ......................................................................................................................... 7 2.6 Equally Average Use of Frequencies And Behaviour ............................................................................... 7 2.7 Pseudorandom Frequency Hopping Sequence ........................................................................................ 8 2.8 Special Accessories .................................................................................................................................. 9 2.9 Equipment Modifications ........................................................................................................................... 9 2.10 Antenna Requirement ............................................................................................................................. 9 3. Test Environment .......................................................................................................................................... 10 3.1 Address of The Test Laboratory .............................................................................................................. 10 3.2 Test Facility .............................................................................................................................................. 10 3.3 Environmental Conditions ....................................................................................................................... 11 3.4 Measurement Uncertainty ....................................................................................................................... 11 3.5 List of Equipment Used ........................................................................................................................... 12 4.System Test Configuration ............................................................................................................................ 14 4.1 EUT Configuration ................................................................................................................................... 14 4.2 EUT Exercise ........................................................................................................................................... 14 4.3 Configuration of Tested System .............................................................................................................. 14 4.4 Equipment Used in Tested System ......................................................................................................... 14 4.5 Summary of Test Results ........................................................................................................................ 15 5. Description of Test Modes ........................................................................................................................... 16 6. RF Output Power Measurement .................................................................................................................. 17 6.1 Provisions Applicable .............................................................................................................................. 17 6.2 Measurement Procedure ......................................................................................................................... 17 6.3 Measurement Setup (Block Diagram of Configuration) .......................................................................... 17 6.4 Measurement Result ............................................................................................................................... 18 7. 20dB Bandwidth and 99% Occupied Bandwidth Measurement ............................................................... 24 7.1 Provisions Applicable .............................................................................................................................. 24 7.2 Measurement Procedure ......................................................................................................................... 24 7.3 Measurement Setup (Block Diagram of Configuration) .......................................................................... 24 7.4 Measurement Results ............................................................................................................................. 25 8. Conducted Band Edge and Out-of-Band Emissions ..........................…

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Report No.: AGC13459231201FR01 Page 71 of 84 Test Graphs of Dwell Time Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2402_Number of Busrt Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2402_Time per Burst Report No.: AGC13459231201FR01 Page 72 of 84 Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2441_Number of Busrt Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2441_Time per Burst Report No.: AGC13459231201FR01 Page 73 of 84 Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2480_Number of Busrt Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2480_Time per Burst Note: The 8DPSK modulation is the worst case and recorded in the report. Report No.: AGC13459231201FR01 Page 74 of 84 Test Data of Dwell Time Channel Time of Pulse for 3DH5 (ms) Number of hops in the period specified in the requirements Sweep Time (ms) Limit (ms) Pass or Fail 2402 2.887 23.0*4 265.604 400 Pass 2441 2.887 33.0*4 381.084 400 Pass 2480 2.886 23.0*4 265.512 400 Pass Report No.: AGC13459231201FR01 Page 75 of 84 Test Graphs of Dwell Time Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2402_Number of Busrt Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2402_Time per Burst Report No.: AGC13459231201FR01 Page 76 of 84 Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2441_Number of Busrt Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2441_Time per Burst Report No.: AGC13459231201FR01 Page 77 of 84 Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2480_Number of Busrt Test_Graph_EDR_HOP_ANT1_NA_3Mbps_2480_Time per Burst Note: The 8DPSK modulation is the worst case and recorded in the report. Report No.: AGC13459231201FR01 Page 78 of 84 12. Frequency Separation Measurement 12.1 Provisions Applicable When the power is less than 0.125W: The minimum permissible channel separation for this system is 2/3 the value of the 20dB BW. When the power is less than 1W: The minimum permissible channel separation for this system is 20dB BW. 12.2 Measurement Procedure The EUT shall have its hopping function enabled. Use the following spectrum analyzer settings: 1. Span: Wide enough to capture the peaks of two adjacent channels. 2. RBW: Start with the RBW set to approximately 30% of the channel spacing; adjust as necessary to best identify the center of each individual channel. 3. Video (or average) bandwidth (VBW) ≥ RBW. 4. Sweep: Auto. 5. Detector function: Peak. 6. Trace: Max hold. g) Allow the trace to stabilize. 7. Use the marker-delta function to determine the separation between the peaks of the adjacent channels. 12.3 Measurement Setup (Block Diagram of Configuration) 12.4 Measurement Result Test Data of Frequency Separation Test Mode Channel Separation (MHz) Limits Pass or Fail 8DPSK Hopping 1.009 >= 2/3 -20dB BW Pass Report No.: AGC13459231201FR01 Page 79 of 84 Test Graphs of Number of Hopping Frequency Test_Graph_EDR_HOP_ANT1_NA_3Mbps_Hopping Separation Note: The 8DPSK modulation is the worst case and recorded in the report. Report No.: AGC13459231201FR01 Page 80 of 84 13. AC Power Line Conducted Emission Test 13.1 Measurement Limit Frequency Maximum RF Line Voltage Q.P. (dBμV) Average (dBμV) 150kHz~500kHz 66-56 56-46 500kHz~5MHz 56 46 5MHz~30MHz 60 50 Note: 1. The lower limit shall apply at the transition frequency. 2. The limit decreases linearly with the logarithm of the frequency in the range 0.15 MHz to 0.50 MHz. 13.2 Measurement Setup (Block Diagram of Configuration) Report No.: AGC13459231201FR01 Page 81 of 84 13.3 Preliminary Procedure of Line Conducted Emission Test 1. The equipment was set up as per the test configuration to simulate typical actual usage per the user’s manual. When the EUT is a tabletop system, a wooden table with a height of 0.8 meters is used and is placed on the ground plane as per ANSI C63.10 (see Test Facility for the dimensions of the ground plane used). When the EUT is a floor-standing equipment, it is placed on the ground plane which has a 3-12 mm non-conductive covering to insulate the EUT from the ground plane. 2. Support equipment, if needed, was placed as per ANSI C63.10. 3. All I/O cables were positioned to simulate typical actual usage as per ANSI C63.10. 4. All support equipment received AC120V/60Hz power from a LISN, if any. 5. The EUT received DC 12V power from adapter which received AC120V/60Hz power from a LISN. 6. The test program was started. Emissions were measured on each current carrying line of the EUT using a spectrum Analyzer / Receiver connected to the LISN powering the EUT. The LISN has two monitoring points: Line 1 (Hot Side) and Line 2 (Neutral Side). Two scans were taken: one with Line 1 connected to Analyzer / Receiver and Line 2 connected to a 50 ohm load; the second scan had Line 1 connected to a 50 ohm load and Line 2 connected to the Analyzer / Receiver. 7. Analyzer / Receiver scanned from 150 kHz to 30MHz for emissions in each of the test modes. 8. During the above scans, the emissions were maximized by cable manipulation. 9. The test mode(s) were scanned during the preliminary test. Then, the EUT configuration and cable configuration of the above highest emission level were recorded for reference of final testing. 13.4 Final Procedure of Line Conducted Emission Test 1. EUT and support equipment was set up on the test bench as per step 2 of the preliminary test. 2. A scan was taken on both power lines, Line 1 and Line 2, recording at least the six highest emissions. Emission frequency and amplitude were recorded into a computer in which correction factors were used to calculate the emission level and compare reading to the applicable limit. If EUT emission level was less – 2dB to the A.V. limit in Peak mode, then the emission signal was re-checked using Q.P and Average detector. 3. The test data of the worst case condition(s) was reported on the Summary Data page. 13.5 Measurement Results Report No.: AGC13459231201FR01 Page 82 of 84 AC Power Line Conducted Emission Test Test Mode Mode 1 LISN Line Hot Side RESULT: Pass Report No.: AGC13459231201FR01 Page 83 of 84 AC Power Line Conducted Emission Test Test Mode Mode 1 LISN Line Neutral Side RESULT: PASS Report No.: AGC13459231201FR01 Page 84 of 84 Appendix I: Photographs of Test …

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Report No.: AGC13459231201AP02 Page 1 of 2 TEST SETUP PHOTOS RADIATED EMISSION TEST SETUP BELOW 1GHz RADIATED EMISSION TEST SETUP ABOVE 1GHz Report No.: AGC13459231201AP02 Page 2 of 2 AC POWER LINE CONDUCTED TEST SETUP RF CONDUCTED TEST SETUP ****************************************End of Report*************************************