2A5X5-PLRVSD300Digital Mobile receiver System

SOUND AROUND INC. Agent Authorization Letter 2022-08-02 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 USA RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Shenzhen Most Technology Service 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, Name: JERRY BRACH Position: CEO Company Name: SOUND AROUND INC. Address: 1600,63 RD STREET,BROOKLYN，NEW YORK 11204,USA Tel / Fax 718-236-8000/N/A E-Mail: [email protected]

SOUND AROUND INC. Long Term Confidentiality Request Letter 2022-08-02 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR (FCC ID: 2A5X5-PLRVSD300) 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 - e.g. Block diagram - e.g. SCH - e.g. Operational Description required to be submitted with this application be permanently withheld from public review. The above documents are company proprietary information that could never get into the possession of your competition. Please contact me if there is any information you may need. Sincerely, Name: JERRY BRACH Position: CEO Company Name: SOUND AROUND INC. Address: 1600,63 RD STREET,BROOKLYN，NEW YORK 11204,USA Tel / Fax 718-236-8000/N/A E-Mail: [email protected]

Model difference letter 2022.08.02 Dear MET Reviewer, This is a new Application from SOUND AROUND INC. Model No: PLRVSD300,PLRVST400, PLRVST300,RV301 Use PLRVSD300 for all tests.Only the model name is different. Thank you for your cooperation! Yours sincerely, Signatory: Name: JERRY BRACH Position: CEO Company Name: SOUND AROUND INC. Address: 1600,63 RD STREET,BROOKLYN，NEW YORK 11204,USA Tel / Fax 718-236-8000 /N/A E-Mail: [email protected]

Model No.: PLRVSD300 FRONT VIEW OF SAMPLE BACK VIEW OF SAMPLE Model No.: PLRVSD300 LEFT VIEW OF SAMPLE RIGHT VIEW OF SAMPLE Model No.: PLRVSD300 TOP VIEW OF SAMPLE BOTTOM VIEW OF SAMPLE

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Name：Digital Mobile receiver System FCC ID: 2A5X5-PLRVSD300 Model:PLRVSD300 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. label size:25mm*35mm

Model No.: PLRVSD300 Page 1 of 4 INTERNAL PHOTO OF SAMPLE INTERNAL PHOTO OF SAMPLE PCB Model No.: PLRVSD300 Page 2 of 4 INTERNAL PHOTO OF SAMPLE PCB INTERNAL PHOTO OF SAMPLE PCB Antenna Location Model No.: PLRVSD300 Page 3 of 4 INTERNAL PHOTO OF SAMPLE PCB INTERNAL PHOTO OF SAMPLE PCB Model No.: PLRVSD300 Page 4 of 4 INTERNAL PHOTO OF SAMPLE PCB

Shenzhen Most Technology Service Co., Ltd. No.5, 2nd Langshan Road, North District, Hi-tech Industrial Park, Nanshan, Shenzhen, Guangdong, China. RF Exposure Evaluation Report Report Reference No. ..................... : FCC ID.. .......................................... : MTWG22060439-H 2A5X5-PLRVSD300 Compiled by ( position+printed name+signature) .. : File administrators Alisa Luo Supervised by ( position+printed name+signature) .. : Test Engineer Sunny Deng Approved by ( position+printed name+signature) .. : Manager Yvette Zhou Date of issue ..................................... : June 21,2022 Representative Laboratory Name .: Shenzhen Most Technology Service Co., Ltd. Address ............................................ : No.5, 2nd Langshan Road, North District, Hi-tech Industrial Park, Nanshan, Shenzhen, Guangdong, China. Applicant’s name ............................ : SOUND AROUND INC Address ............................................ : 1600 63RD STREET，BROOKLYN NEW YORK 11204，USA Test specification/ Standard ..........: 47 CFR Part 1.1307 47 CFR Part 1.1310 KDB447498D01 General RF Exposure Guidance v06 TRF Originator .................................. : Shenzhen Most Technology Service Co., Ltd. Shenzhen Most Technology Service Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen Most Technology Service Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen Most Technology Service Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description ..................... : MARINE Trade Mark ....................................... : PYLE Manufacturer .................................... : SOUND AROUND INC Model/Type reference....................... : PLRVSD300 Listed Models .................................. : PLRVST400, PLRVST300,RV301 Modulation Type ............................... : GFSK, π/4DQPSK, 8DPSK Operation Frequency ........................ : From 2402MHz to 2480MHz Hardware Version .............................. MB:2021.11.17 Software Version ............................... 20211206U1 Rating ................................................ DC 12V Result................................................ : PASS Report No.: MTWG22060439-H Page 2 of 5 T E S T R E P O R T Equipment under Test : MARINE Model /Type : PLRVSD300 Listed Models : PLRVST400, PLRVST300,RV301 Remark Only the model name is different. Applicant : SOUND AROUND INC Address : 1600 63RD STREET，BROOKLYN NEW YORK 11204，USA Manufacturer : SOUND AROUND INC Address : 1600 63RD STREET，BROOKLYN NEW YORK 11204，USA Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: MTWG22060439-H Page 3 of 5 1. Revision History Revision Issue Date Revisions Revised By 00 2022.06.21 Initial Issue Alisa Luo Report No.: MTWG22060439-H Page 4 of 5 2. SAR Evaluation 2.1 RF Exposure Compliance Requirement 2.1.1 Standard Requirement According to §1.1307(e)(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 §1.1310 and §2.1091 RF exposure is calculated. KDB447498 D01: Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies 2.1.2 Limits F= Frequency in MHz Friis Formula Friis transmission formula: Pd = (Pout*G)/(4* Pi * R 2) Where Pd = power density in mW/cm2 Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = distance between observation point and center of the radiator in cm Pd id the limit of MPE, 1 mW/cm2 . If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. Report No.: MTWG22060439-H Page 5 of 5 2.1.3 EUT RF Exposure Antenna Gain: -2dBi Antenna Gain: The maximum Gain measured in fully anechoic chamber is 2.4 in linear scale. Output Power Into Antenna & RF Exposure Evaluation Distance: BT classic GFSK Test channel Peak Output Power (dBm) Tune up tolerance (dBm) Maximum tune-up Power (dBm) Lowest(2402MHz) 1.084 1.084±1 2.084 Middle(2441MHz) 1.006 1.006±1 2.006 Highest(2480MHz) 0.757 0.757±1 1.757 π/4DQPSK Test channel Peak Output Power (dBm) Tune up tolerance (dBm) Maximum tune-up Power (dBm) Lowest(2402MHz) 2.880 2.880±1 3.880 Middle(2441MHz) 2.879 2.879±1 3.879 Highest(2480MHz) 2.551 2.551±1 3.551 8DPSK Test channel Peak Output Power (dBm) Tune up tolerance (dBm) Maximum tune-up Power (dBm) Lowest(2402MHz) 3.004 3.004±1 4.004 Middle(2441MHz) 3.127 3.127±1 4.127 Highest(2480MHz) 2.897 2.897±1 3.897 BT classic Worst case: 8DPSK Channel Maximum Peak Conducted Output Power (dBm) Maximum Peak Conducted Output Power (MW) Antenna Gain (dBi) Power Density at R = 20 cm (mW/cm2) Limit Result Highest(2441MHz) 4.127 2.59 -2 0.0003 1.0 Pass Note: 1) Refer to report MTWG22030187-R for EUT test Max Conducted average Output Power value. Note: 2) Pd = (Pout*G)/(4* Pi * R2)=(2.59*0.63)/(4*3.1416*20 2 )=0.0003 Note: 3) EUT's Bluetooth module is more than 20cm away from the human body.. .......................THE END OF REPORT.........................

Shenzhen Most Technology Service Co., Ltd. No.5, 2nd Langshan Road, North District, Hi-tech Industrial Park, Nanshan, Shenzhen, Guangdong, China. TEST REPORT FCC Rules Part 15.247 Report Reference No. .....................: FCC ID.. .......................................... : MTWG22060441-R 2A5X5-PLRVSD300 Compiled by ( position+printed name+signature) .. : File administrators Alisa Luo Supervised by ( position+printed name+signature) .. : Test Engineer Sunny Deng Approved by ( position+printed name+signature) .. : Manager Yvette Zhou Date of issue ..................................... : June 21,2022 Representative Laboratory Name .: Shenzhen Most Technology Service Co., Ltd. Address ............................................ : No.5, 2nd Langshan Road, North District, Hi-tech Industrial Park, Nanshan, Shenzhen, Guangdong, China. Applicant’s name ............................ : SOUND AROUND INC Address ............................................ : 1600 63RD STREET，BROOKLYN NEW YORK 11204，USA Test specification/ Standard ..........: FCC Rules Part 15.247 TRF Originator .................................. : Shenzhen Most Technology Service Co., Ltd. Shenzhen Most Technology Service Co., Ltd. All rights reserved. This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen Most Technology Service Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen Most Technology Service Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Test item description ..................... : Digital Mobile receiver System Trade Mark ....................................... : PYLE Manufacturer .................................... : SOUND AROUND INC Model/Type reference....................... : PLRVSD300 Listed Models .................................. : PLRVST400, PLRVST300,RV301 Modulation Type ............................... : GFSK, π/4DQPSK, 8DPSK Operation Frequency ........................ : From 2402MHz to 2480MHz Hardware Version .............................. MB:2021.11.17 Software Version ............................... 20211206U1 Rating ................................................ DC 12V Result................................................ : PASS Report No.: MTWG22060441-R Page 2 of 40 T E S T R E P O R T Equipment under Test : Digital Mobile receiver System Model /Type : PLRVSD300 Listed Models : PLRVST400, PLRVST300,RV301 Remark Only the model name is different. Applicant : SOUND AROUND INC Address : 1600 63RD STREET，BROOKLYN NEW YORK 11204，USA Manufacturer : SOUND AROUND INC Address : 1600 63RD STREET，BROOKLYN NEW YORK 11204，USA Test Result: PASS The test report merely corresponds to the test sample. It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: MTWG22060441-R Page 3 of 40 Contents 1 REVISION HISTORY ................................................................ 4 2 TEST STANDARDS .................................................................. 5 3 SUMMARY ............................................................................. 6 3.1 General Remarks 6 3.2 Product Description 6 3.3 Equipment Under Test 6 3.4 Short description of the Equipment under Test (EUT) 6 3.5 EUT operation mode 7 3.6 Block Diagram of Test Setup 7 3.7 Test Item (Equipment Under Test) Description* 7 3.8 Auxiliary Equipment (AE) Description 7 3.9 Antenna Information* 7 3.10 Related Submittal(s) / Grant (s) 8 3.11 Modifications 8 4 TEST ENVIRONMENT ............................................................... 9 4.1 Address of the test laboratory 9 4.2 Environmental conditions 9 4.3 Summary of measurement results 10 4.4 Statement of the measurement uncertainty 10 4.5 Equipments Used during the Test 11 5 TEST CONDITIONS AND RESULTS ............................................ 12 5.1 AC Power Conducted Emission 12 5.2 Radiated Emission 13 5.3 Maximum Peak Output Power 19 5.4 20dB Bandwidth 20 5.5 Frequency Separation 23 5.6 Number of hopping frequency 26 5.7 Time of Occupancy (Dwell Time) 28 5.8 Spurious RF Conducted Emission 31 5.9 Pseudorandom Frequency Hopping Sequence 37 5.10 Antenna Requirement 38 6 TEST SETUP PHOTOS OF THE EUT .......................................... 39 7 PHOTOS OF THE EUT ............................................................. 40 Report No.: MTWG22060441-R Page 4 of 40 1 Revision History Revision Issue Date Revisions Revised By 00 2022-06-21 Initial Issue Alisa Luo Report No.: MTWG22060441-R Page 5 of 40 2 TEST STANDARDS The tests were performed according to following standards: FCC Rules Part 15.247 : Frequency Hopping, Direct Spread Spectrum and Hybrid Systems that are in operation within the bands of 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz. ANSI C63.10-2013 : American National Standard for Testing Unlicensed Wireless Devices Report No.: MTWG22060441-R Page 6 of 40 3 SUMMARY 3.1 General Remarks Date of receipt of test sample : 2022.06.13 Testing commenced on : 2022.06.14 Testing concluded on : 2022.06.21 3.2 Product Description Product Name: Digital Mobile receiver System Model/Type reference: PLRVSD300 Power Supply： DC12V Testing sample ID： MT22060150 Bluetooth : Supported Type: Bluetooth BR/EDR Modulation: GFSK, π/4DQPSK, 8DPSK Operation frequency: 2402MHz~2480MHz Channel number: 79 Channel separation: 1MHz Antenna type: PCB antenna Antenna gain: -2 dBi 3.3 Equipment Under Test Power supply system utilised Power supply voltage : ○ 230V / 50 Hz ○ 120V / 60Hz ● 12 V DC ○ 24 V DC ○ Other (specified in blank below) 3.4 Short description of the Equipment under Test (EUT) This is a Digital Mobile receiver System For more details, refer to the user’s manual of the EUT. Report No.: MTWG22060441-R Page 7 of 40 3.5 EUT operation mode The Applicant provides communication tools software(Engineer mode) to cont…

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Model No.: PLRVSD300 RE TEST SETUP RE TEST SETUP