2A4WA-C57Wireless Audio Receiver

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. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

Dongguan Jieshengda Intelligent Technology Co., Ltd. Agent Authorization Company: Dongguan Jieshengda Intelligent Technology Co., Ltd. Address: Room 201, Building 4, No. 103, Binhe North Road, Guanjingtou, Fenggang Town, Dongguan City, Guangdong Province,China Product Name: Wireless Audio Receiver Model Number(s): C57, C51, C52, C22, C36, C33S, C41S, C21, C39HD, HD09, C5, BT6, C53, C56, T26, T13, T14, T11, 09S, T10, C41, C11, C39, C39S, T7, T9, T17, T96, T12, B12, X1, BT-13, BT12, BT-3, T15, C28, C33, C31, C29, C34, C35, C37, C42, C43, C44, C45, C46, C28S, T1, T19, C32, TYPE-C, T15, T2, C68, C68S, BT17, C36S, C71, C72, C73, C74, C75, C76, C77, C79 Product Description: Wireless Audio Receiver 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: 2022-12-29 Name: Chen XiaoGuang Company: Dongguan Jieshengda Intelligent Technology Co., Ltd.

Dongguan Jieshengda Intelligent Technology Co., Ltd. Dec.29, 2022 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Subject: Explanation of differences between product types FCC ID : 2A4WA-C57 Model Number: C57, C51, C52, C22, C36, C33S, C41S, C21, C39HD, HD09, C5, BT6, C53, C56, T26, T13, T14, T11, 09S, T10, C41, C11, C39, C39S, T7, T9, T17, T96, T12, B12, X1, BT-13, BT12, BT-3, T15, C28, C33, C31, C29, C34, C35, C37, C42, C43, C44, C45, C46, C28S, T1, T19, C32, TYPE-C, T15, T2, C68, C68S, BT17, C36S, C71, C72, C73, C74, C75, C76, C77, C79 To Whom It May Concern: We, The Dongguan Jieshengda Intelligent Technology Co., Ltd. hereby declare that the models are identical except the model name. Except for the different above, no other modification is performed. Sincerely, Signature: Dongguan Jieshengda Intelligent Technology Co., Ltd. Contact person: Chen XiaoGuang

Report No.: AGC00793221203AP02 Page 1 of 3 EXTERNAL PHOTOS TOP VIEW OF EUT BOTTOM VIEW OF EUT Report No.: AGC00793221203AP02 Page 2 of 3 FRONT VIEW OF EUT BACK VIEW OF EUT Report No.: AGC00793221203AP02 Page 3 of 3 LEFT VIEW OF EUT RIGHT VIEW OF EUT ****************************************End of Report****************************************

FCC ID Label Location 40mm&10mm FCC ID: 2A4WA-C57

Report No.: AGC00793221203AP02 Page 1 of 3 INTERNAL PHOTOS VIEW OF EUT(PORT) OPEN VIEW OF EUT Report No.: AGC00793221203AP02 Page 2 of 3 VIEW OF BATTERY INTERNAL VIEW OF EUT-1 BT Antenna Report No.: AGC00793221203AP02 Page 3 of 3 INTERNAL VIEW OF EUT-2 INTERNAL VIEW OF EUT-3 ****************************************End of Report****************************************

RF EXPOSURE EVALUATION 1. PRODUCT INFORMATION Product Description Wireless Audio Receiver Model Name C57 Series Model C51, C52, C22, C36, C33S, C41S, C21, C39HD, HD09, C5, BT6, C53, C56, T26, T13, T14, T11, 09S, T10, C41, C11, C39, C39S, T7, T9, T17, T96, T12, B12, X1, BT-13, BT12, BT-3, T15, C28, C33, C31, C29, C34, C35, C37, C42, C43, C44, C45, C46, C28S, T1, T19, C32, TYPE-C, T15, T2, C68, C68S, BT17, C36S, C71, C72, C73, C74, C75, C76, C77, C79 FCC ID 2A4WA-C57 2. EVALUATION METHOD According to 447498 D01 General RF Exposure Guidance v06 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)] ·[√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 3. CALCULATION BR&EDR: P t =-0.060dBm=0.99mW The value of the Maximum output power P t is referred to the test report of the CFR47 §15.247. The result for RF exposure evaluation SAR=(0.99mW / 5mm).[√2.402GHz)]=0.307<3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR. 4. CONCLUSION The SAR evaluation is not required.

2.04dBi product model name_antenna model name_PCB Antenna Test Equipment:C57-ANT 1. Electrical Characteristics No. Item Specifications 1 Working Central Frequency 2450 MHz 2 Band Width 3 Gain 4 V.S.W.R (in BW) ≤2.0 5 Polarization Linear 6 Azimuth Beam width Omni-directional 7 Impedance 阻抗 50  2400~2500MHZ 2.Return Loss and Smith Chat - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 2 000 2 100 2 200 2 300 2 400 2 500 2 600 2 700 2 800 2 900 3 000 M 1 M 2 M 3 M4 Return Loss Current Resolution: 517 Std: ---Date: Sep/ Model: S332D Serial #: 00924093 Time: 14:16:43 Channel: N/A FlexCAL:ON(COAX) CW: ON dB Frequency (2000.0 - 3000.0 MHz) M 1: -12.90 dB @ 2397.387 MHz M 2: -19.64 dB @ 2451.550 MHz M 3: -15.75 dB @ 2482.658 MHz M 4: -.28 dB @ 2000.100 MHz 3． ． ． ．Physical Test Environment Antitsu S332D 0 .2 0 .4 0 .6 0 .8 1 1 .5 2 3 4 5 1 0 2 0 5 0 0 .2 0 .4 0 .6 0 .8 1 1 .5 2 3 4 5 1 0 2 0 5 0 - 0.2 - 0.4 - 0.6 - 0.8 - 1 - 1.5 - 2 - 3 - 4 - 5 - 10 - 20 - 50 M 1 M 2 M 3 M 4 Smith Chart Current Resolution: 517 Date: Sep/ Model: S332D Serial #: 00924093 Time: 14:16:43 Prop.Vel:.800 FlexCAL:ON(COAX) CW ON M 1: r=1.48, x=0.30 @ 2397.387 MHz M 2: r=1.02, x=-0.21 @ 2451.65 MHz M 3: r=0.75, x=-0.14 @ 2482.658 MHz M 4: r=0.02, x=0.43 @ 2000.10 MHz 4.Shape of the antenna 5 Radiation Pattern （dBi） （dBi） END （dBi)

Page 1 of 69 FCC Test Report Report No.: AGC00793221203FE03 FCC ID : 2A4WA-C57 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Wireless Audio Receiver BRAND NAME : N/A MODEL NAME : C57, C51, C52, C22, C36, C33S, C41S, C21, C39HD, HD09, C5, BT6, C53, C56, T26, T13, T14, T11, 09S, T10, C41, C11, C39, C39S, T7, T9, T17, T96, T12, B12, X1, BT-13, BT12, BT-3, T15, C28, C33, C31, C29, C34, C35, C37, C42, C43, C44, C45, C46, C28S, T1, T19, C32, TYPE-C, T15, T2, C68, C68S, BT17, C36S, C71, C72, C73, C74, C75, C76, C77, C79 APPLICANT : Dongguan Jieshengda Intelligent Technology Co., Ltd. DATE OF ISSUE : Dec. 22, 2022 STANDARD(S) : FCC Part 15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC00793221203FE03 Page 2 of 69 REPORT REVISE RECORD Report Version Revise Time Issued Date Valid Version Notes V1.0 / Dec. 22, 2022 Valid Initial Release Report No.: AGC00793221203FE03 Page 3 of 69 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 ........................................................................................................................................ 19 8.1. MEASUREMENT PROCEDURE ............................................................................................................. 19 8.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) .................................................................... 19 8.3. LIMITS AND MEASUREMENT RESULTS ............................................................................................... 20 9. CONDUCTED SPURIOUS EMISSION........................................................................................................... 25 9.1. MEASUREMENT PROCEDURE ............................................................................................................. 25 Report No.: AGC00793221203FE03 Page 4 of 69 9.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) .................................................................... 25 9.3. MEASUREMENT EQUIPMENT USED .................................................................................................... 25 9.4. LIMITS AND MEASUREMENT RESULT .................................................................................................. 25 10. RADIATED EMISSION ................................................................................................................................. 46 10.1. MEASUREMENT PROCEDURE ........................................................................................................... 46 10.2. TEST SETUP ......................................................................................................................................... 48 10.3. LIMITS AND MEASUREMENT RESULT .......…

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Report No.: AGC00793221203FE03 Page 59 of 69 11. NUMBER OF HOPPING FREQUENCY 11.1. MEASUREMENT PROCEDURE The EUT shall have its hopping function enabled. Use the following spectrum analyzer settings: 1. Span: The frequency band of operation. Depending on the number of channels the device supports, it may be necessary to divide the frequency range of operation across multiple spans, to allow the individual channels to be clearly seen. 2. RBW: To identify clearly the individual channels, set the RBW to less than 30% of the channel spacing or the 20 dB bandwidth, whichever is smaller. 3. VBW ≥ RBW. Sweep: Auto. Detector function: Peak. Trace: Max hold. 4. Allow the trace to stabilize. 11.2. TEST SETUP (BLOCK DIAGRAM OF CONFIGURATION) Same as described in section 8.2 11.3. MEASUREMENT EQUIPMENT USED The same as described in section 6 11.4. LIMITS AND MEASUREMENT RESULT Test Data of Number of Hopping Frequency Test Mode Number of Hopping Frequency Limits Pass or Fail GFSK Hopping 79 >=15 Pass Test Graphs of Number of Hopping Frequency Test_Graph_BR_HOP_ANT1_NA_1Mbps_Number of Hopping Note: The GFSK modulation is the worst case and recorded in the report. Report No.: AGC00793221203FE03 Page 60 of 69 12. TIME OF OCCUPANCY (DWELL TIME) 12.1. MEASUREMENT PROCEDURE The EUT shall have its hopping function enabled. Use the following spectrum analyzer settings: 1. Span: Zero span, centered on a hopping channel. 2. RBW shall be≤channel spacing and where possible RBW should be set >> 1 / T, where T is the expected dwell time per channel. 3. Sweep: As necessary to capture the entire dwell time per hopping channel; where possible use a video trigger and trigger delay so that the transmitted signal starts a little to the right of the start of the plot. The trigger level might need slight adjustment to prevent triggering when the system hops on an adjacent channel; a second plot might be needed with a longer sweep time to show two successive hops on a channel. 4. Detector function: Peak. Trace: Max hold. 5. Use the marker-delta function to determine the transmit time per hop. 6. Repeat the measurement using a longer sweep time to determine the number of hops over the period specified in the requirements. The sweep time shall be equal to, or less than, the period specified in the requirements. Determine the number of hops over the sweep time and calculate the total number of hops in the period specified in the requirements, using the following equation: (Number of hops in the period specified in the requirements) = (number of hops on spectrum analyzer) × (period specified in the requirements / analyzer sweep time) 7. The average time of occupancy is calculated from the transmit time per hop multiplied by the number of hops in the period specified in the requirements. 12.2. TEST SETUP (BLOCK DIAGRAM OF CONFIGURATION) Same as described in section 8.2 12.3. MEASUREMENT EQUIPMENT USED The same as described in section 6 12.4. LIMITS AND MEASUREMENT RESULT Test Data of Dwell Time Channel Time of Pulse for DH5 (ms) Number of hops in the period specified in the requirements Sweep Time (ms) Limit (ms) Pass or Fail 2402 2.866 27.0*4 309.528 400 Pass 2441 2.866 27.0*4 309.528 400 Pass 2480 2.866 27.0*4 309.528 400 Pass Note: The GFSK modulation is the worst case and recorded in the report. Report No.: AGC00793221203FE03 Page 61 of 69 Test Graphs of Dwell Time Test_Graph_BR_HOP_ANT1_NA_1Mbps_2402_Number of Busrt Test_Graph_BR_HOP_ANT1_NA_1Mbps_2402_Time per Burst Report No.: AGC00793221203FE03 Page 62 of 69 Test_Graph_BR_HOP_ANT1_NA_1Mbps_2441_Number of Busrt Test_Graph_BR_HOP_ANT1_NA_1Mbps_2441_Time per Burst Report No.: AGC00793221203FE03 Page 63 of 69 Test_Graph_BR_HOP_ANT1_NA_1Mbps_2480_Number of Busrt Test_Graph_BR_HOP_ANT1_NA_1Mbps_2480_Time per Burst Report No.: AGC00793221203FE03 Page 64 of 69 13. FREQUENCY SEPARATION 13.1. 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. e) Detector function: Peak. f) Trace: Max hold. g) Allow the trace to stabilize. Use the marker-delta function to determine the separation between the peaks of the adjacent channels. 13.2. TEST SETUP (BLOCK DIAGRAM OF CONFIGURATION) Same as described in section 6.2 13.3. MEASUREMENT EQUIPMENT USED The same as described in section 6.3 13.4. LIMITS AND MEASUREMENT RESULT Test Data of Frequency Separation Test Mode Channel Separation (MHz) Limits Pass or Fail GFSK Hopping 1.017 >= 2/3 -20dB BW Pass Test Graphs of Number of Hopping Frequency Test_Graph_BR_HOP_ANT1_NA_1Mbps_Hopping Separation Note: The GFSK modulation is the worst case and recorded in the report. Report No.: AGC00793221203FE03 Page 65 of 69 14. LINE CONDUCTED EMISSION TEST 14.1. LIMITS OF LINE CONDUCTED EMISSION TEST 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. 14.2. BLOCK DIAGRAM OF LINE CONDUCTED EMISSION TEST EUT & Support Units Report No.: AGC00793221203FE03 Page 66 of 69 14.3. 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 grou…

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Report No.: AGC00793221203AP01 Page 1 of 2 TEST SETUP PHOTOS RADIATED EMISSION TEST SETUP BELOW 1GHz RADIATED EMISSION TEST SETUP ABOVE 1GHz Report No.: AGC00793221203AP01 Page 2 of 2 AC POWER LINE CONDUCTED TEST SETUP RF CONDUCTED TEST SETUP ****************************************End of Report*************************************