2BEK7ATM610Audio Transceiver

USER MANUAL ATM610 Audio Transceiver, 2.4GHz 26.0x40.4x3.2[mm], 24pin FFC Version: 01 1 /14 August 07, 2024 User Manual 1. General Specification The ATM610 functions as either the transmitter (arbiter) or receiver (client) for advanced 2.4 GHz wireless audio applications. It creates simple or sophisticated wireless audio networks. The module is also equipped with an RF amplifier at the radio transmit out end of module to support further extended transmission distances. This wireless audio module provides a highly-integrated and flexible wireless audio solution based on the SKY76305 SoC. The module contains all the necessary radio transceiver and digital baseband circuitry to form a complete digital wireless node without the need for external processing. The module contains all the necessary power management and analog circuitry needed to operate the chip. The chip is powered from a +3.3 V supply input (powering the internal +3.3 V output LDO) The RF section and wireless protocol of this module has been certified globally, including North America, Europe, China, Japan and Korea. Features:  Device Type : Wireless Audio module  Wireless : SRD (Short-Range-Device) using 2.4GHz ISM band  Product Size - Module Size (mm): 26.0 (W) X 40.4 (L) X 3.2 (H) - PCB size (mm): 26.0 (W) X 40.4 (L) x 1.2 (H) - Shield can (mm): 24.7 (W) X 21.75 (L) X 2.0(H) - Antenna Type : PCB Printed Antenna  Complete I2S to I2S audio communication system - 24bit I2S Audio interface and 120dB SNR Over-The-Air Link  Frequency range : 2404.35~2474.35 MHz  Low, fixed latency (typically less then 20ms)  3Mbps or 6Mbps OTA data rate  Multiple OTA audio configurations  Forward error correction coding, error detection, and audio-specific error concealment  Auto-search/sync and dynamic channel selection  Capability to detect and avoid wideband interferences such as 2.4GHz band WLAN  Sample rate converter: Support for 32 - 96kHz input sample rates  Dual printed PCB diversity antennas for multipath and fading migrations  Control interfaces: I2C  Multiple GPIOs  Dual printed PCB diversity antennas for multipath and fading mitigation Applications:  Soundbar with Wireless Subwoofer or/and Wireless Surround Speakers  Home theater Wireless speaker USER MANUAL ATM610 Audio Transceiver, 2.4GHz 26.0x40.4x3.2[mm], 24pin FFC Version: 01 2 /14 August 07, 2024 2. Module Identification The hardware for the audio input (transmit) and audio output (receive) versions of the module is identical and only the firmware loaded onto the module determines its function. The distinction according to the module's function is to be identified by the module's label color and code name. TX RX The module’s label displays the following information: USER MANUAL ATM610 Audio Transceiver, 2.4GHz 26.0x40.4x3.2[mm], 24pin FFC Version: 01 3 /14 August 07, 2024 3. Module Connection The ATM610 has a 24pin FFC connector, and the connection with the external device should use FFC cable.  Pin assignment (24pin I/O connector) Pin Pin name Pin Type Description 1 GPIO32/S_SSB/TDO Digital I/O General purpose IO/ SPI slave SSB/ JTAG data out 2 GPIO31/S_SCLK/TCK Digital I/O General purpose IO/ SPI slave SCLK/ JTAG clock 3 GPIO30/S_SDA/S_MOSI/TMS Digital I/O General purpose IO/ SPI slave MOSI/ JTAG test mode select 4 GPIO9/S_SCL/S_MISO/TDI Digital I/O General purpose IO/ SPI slave MOSI/ JTAG data in 5 GPIO28/M_SDA Digital I/O General purpose IO / Master I2C data 6 GPIO27/M_SCL Digital I/O General purpose IO / Master I2C clock 7 GPIO26/LINK_LED Digital I/O General purpose IO / Link LED 8 GPIO25/PAIR Digital I/O General purpose IO / Pair LED 9 GPIO24/BCLK1 Digital I/O General purpose IO / Bit clock 1 10 GPIO23/WCLK1 Digital I/O General purpose IO / Word clock 1 11 GPIO10/MCLK Digital I/O General purpose IO / Master clock 12 GND Ground 13 GPIO21/BCLK0 Digital I/O General purpose IO / Bit clock 0 14 GPIO20/WCLK0 Digital I/O General purpose IO / Word clock 0 15 GPIO19/ADAT0 Digital I/O General purpose IO / I2S audio data 0 16 GPIO18/ADAT1 Digital I/O General purpose IO / I2S audio data 1 17 GPIO17/ADAT2/CEN Digital I/O General purpose IO / I2S audio data 2 / Chip enable 18 GPIO15/D+ Digital I/O General purpose IO / USB data I/O positive; 3.3 V USB signaling 19 GPIO14/D- Digital I/O General purpose IO / USB data I/O negative; 3.3 V USB signaling 20 GPIO13/ADAT3 Digital I/O General purpose IO / I2S audio data 3 21 RESETN_EXT Analog Reset input; active low; capacitor load. Drive with open drain device. 22 GND Ground 23 VDD Supply Input 3.3V supply input or BATT input 24 VDD Supply Input 3.3V supply input or BATT input Pin #1 Pin#24 USER MANUAL ATM610 Audio Transceiver, 2.4GHz 26.0x40.4x3.2[mm], 24pin FFC Version: 01 4 /14 August 07, 2024 4. Applications The ATM610 module is available in two variations; digital input transmitter or digital output receiver. There are two available I2S digital audio data inputs/outputs, each of these can be configured to operate as either a master or a slave – depending on the application, the I2S ports can operate simultaneously as either inputs or outputs. When configured as slaves, the I2S inputs/outputs can be independently clocked by up to two external masters. In addition, MCLK can be output from the module to provide a reference clock source to an external ADC or DAC. MCLK can also be input to the module to provide a reference clock from an external source. USER MANUAL ATM610 Audio Transceiver, 2.4GHz 26.0x40.4x3.2[mm], 24pin FFC Version: 01 5 /14 August 07, 2024 5. Electrical Specifications 5-1. Absolute Maximum Ratings Absolute Maximum Ratings (AMR) are stress ratings only. AMR corresponds to the maximum value that can be applied without leading to instantaneous or very short-term unrecoverable hard failure (destructive breakdown). Stresses beyond those listed under AMR may cause permanent damage to the device. Functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating…

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Date: September 3, 2024 Certification Attestation Statements Attn: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA FCC ID : 2BEK7ATM610 To Whom It May Concern: 47 CFR section 2.911(d)(5)(i) Attestation Statement SJIT Co.,Ltd certifies that as of the date of the application the equipment for which authorization is sought is not “covered” equipment 1 prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. If the equipment for which the applicant seeks authorization is produced by any of the entities identified on the current Covered List, including affiliates or subsidiaries of the named companies, the applicant must include an explanation on why the equipment is not “covered” equipment. Additional Explanation: - 47 CFR section 2.911(d)(5)(ii) Attestation Statement SJIT Co.,Ltd (“the applicant”) certifies that, as of the date of the filing of this application, the applicant ☐ - is / ☐ - is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Thank you, Signature : Name : Wan Seong Kim Title Manager Company: SJIT Co.,Ltd Tel # : +82-31-222-8194 1 - The Commission’s Covered List is published by the Public Safety and Homeland Security Bureau and posted on the Commission’s website. This Covered List, which is periodically updated, identifies particular equipment, produced by particular entities, that constitutes “covered” equipment. https://www.fcc.gov/supplychain/coveredlist . 2 - Letters should be placed on appropriate letterhead.

U.S. Agent Designation for Service of Process ATTENTION: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA REGARDING: FCC Certification – Section 2.911(d)(7) Information Designated U.S. Agent Company Name: Approve-IT, Inc. Contact Name: Nathan Grinager Street Address: 8011 34 th Ave South, Suite 342 City/Province/Zip: Bloomington, MN 55425 Telephone No: 651-247-1678 Emai l: [email protected] FRN #: 0027533835 This letter is to confirm that w e (“the Designated U.S. Agent) have accep ted th e responsibility to ac t as the Designated U.S . Agent for Se rvice of Process as required by sec tion 47 CFR 2.911(d)(7) on behalf of the Applicant noted below. U.S. Agent Signature: Date: March 18, 2024 Signed by (Printed Name/Title): Nathan Grinager / Co-President *This letter is va lid indefinitely for a ll applications submitted wi thin the period of 03/18/2024 – 03/18/2025. The Applicant confirms its explicit consent and acknowledges that they must maintain an agent for no less than one year after terminating all marketing and importation OR the conclusion of any Commission-related proceeding involving the equipment. The applicant further acknowledges their responsibility to inform the FCC whenever the Designated U.S. Agent information above changes. Applicant Company name: SJIT Co., Ltd Grantee FRN: 0034759704 Grantee Code: 2BEK7 Contact Name: Wan Seong Kim Street Address: 54-11, Dongtanhana 1-gil, City/Province/Zip: Hwaseong-si, Gyeonggi-do, Republic of Korea Telephone No: +82-31-222-8194 Email: [email protected] Applicant Signature: Date: March 18, 2024 Signed by (Printed Name/Title): Wan Seong Kim / Manager

54-11, Dongtanhana 1-gil, Hwaseong-si, Gyeonggi-do, Republic of Korea Tel No : +82-31-222-8194 Special Power of Attorney Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Sincerely, NAME: Wan Seong Kim Title: Manager Applicant: SJIT Co.,Ltd Date : August 21, 2024 SUBJECT: FCC Application for (FCC ID : 2BEK7ATM610) To Whom It May Concern: I, Wan Seong Kim SJIT Co.,Ltd hereby authorize appoint Sung kwon Park of SJIT Co.,Ltd to represent me to act on my behalf to do any and all of the following: Sign on my behalf the agency, anti-drug and confidentiality cover letters and apply to FCC for the products. The right, powers, and authority in fact to exercise any and all of the rights and powers herein granted shell commence and be in full force from 2025/04/08 and continue to effective unless specifically terminated by either party.

54-11, Dongtanhana 1-gil, Hwaseong-si, Gyeonggi-do, Republic of Korea Tel No : +82-31-222-8194 Special Power of Attorney Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date : August 21, 2024 SUBJECT: FCC Application for (FCC ID : 2BEK7ATM610) To Whom It May Concern: We, the undersigned, hereby authorize Min Wook, Jung at CTK Co., Ltd. on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by CTK on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Sincerely, NAME: Sung kwon Park Title: Senior Research Engineer Applicant: SJIT Co.,Ltd

54-11, Dongtanhana 1-gil, Hwaseong-si, Gyeonggi-do, Republic of Korea Tel No : +82-31-222-8194 MODULAR APPROVAL LETTER Date : August 21, 2024 Applicant : SJIT Co.,Ltd FCC ID : 2BEK7ATM610 We would like to answer for Single Modular Approval in accordance with the requirement of rule part 15.212 as described below No. Requirements Comment Comply (Y/N) 1 The radio element of the modular transmitter has its own shielding Refer to the external photo Y 2 The modular transmitter must have buffered modulation data/inputs (if such inputs are provided) All input to the modules are buffered through microprocessor inputs. Y 3 The modular transmitter must have its own power supply regulation. Internal power regulators Refer to the Block-diagram Y 4 The modular transmitter must comply with the antenna requirements of Section 15.203 and 15.204(c). Refer to the internal photo Y 5 The modular transmitter must be tested in a stand-alone configuration, i.e., the module must not be inside another device during testing. The EUT was tested in a standalone configuration via a SD extension cable Refer to the test setup photo Y 6 The modular transmitter must be labeled with its own FCC ID. If the FCC ID is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module Refer to the user manual Y 7 The modular transmitter must comply with any specific rules or operating requirements that ordinarily apply to a complete transmitter and the manufacturer must provide adequate instructions along with the module to explain any such requirements Refer to the user manual Y 8 The modular transmitter must comply with any applicable RF exposure requirements Refer to the RF exposure statement for more details. Y Sincerely, NAME: Sung kwon Park Title: Senior Research Engineer Applicant: SJIT Co., Ltd

54-11, Dongtanhana 1-gil, Hwaseong-si, Gyeonggi-do, Republic of Korea Tel No : +82-31-222-8194 Rev 11/20/07 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date : August 21, 2024 SUBJECT: FCC Application for (FCC ID : 2BEK7ATM610) Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Block Diagram Schematics Schematics_PCB Layout Parts List ATM610_Block Diagram.pdf ATM610_Schematics.pdf ATM610_Schematics_PCB Layout.pdf ATM610_Part List.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, NAME: Sung kwon Park Title: Senior Research Engineer Applicant: SJIT Co.,Ltd

CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com EUT External Photographs CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com

CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com Label Photographs

CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com EUT Internal Photographs CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com [Antenna]

CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com Page 1 of 3 RF EXPOSURE EVALUATION FCC ID : 2BEK7ATM610 IC : 32019-ATM610 HVIN : ATM610 [FCC] Standard Requirement The following FCC Rule Parts and procedures are applicable : Part 1.1310 Radiofrequency radiation exposure limits Part 2.1091 Radiofrequency radiation exposure evaluation : Mobile device KDB447498 D01 v06 Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies Table 1 below sets forth limits for Maximum Permissible Exposure (MPE) to radiofrequency electromagnetic fields. Table 1—Limits for Maximum Permissible Exposure (MPE) Frequency range (MHz) Electric field strength (V/m) Magnetic field strength (A/m) Power density (mW/cm 2 ) Averaging time (minutes) (A) Limits for Occupational/Controlled Exposure 0.3-3.0 614 1.63 *100 6 3.0-30 1842/f 4.89/f *900/f 2 6 30-300 61.4 0.163 1.0 6 300-1,500 f/300 6 1,500-100,000 5 6 (B) Limits for General Population/Uncontrolled Exposure 0.3-1.34 614 1.63 *100 30 1.34-30 824/f 2.19/f *180/f 2 30 30-300 27.5 0.073 0.2 30 300-1,500 f/1500 30 1,500-100,000 1.0 30 f = frequency in MHz * = Plane-wave equivalent power density CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com Page 2 of 3 [ISED] - ISED Rules RSS 102(Issue 6) 6.6 Exemption Limits for Routine Evaluation – RF Exposure Evaluation Field reference level exposure exemption limits Field reference level (FRL) exposure evaluation is required if the separation distance between the user and/or bystander and the device’s radiating element is greater than 20 cm (i.e. mobile devices), except when the device operates as follows: • below 20 MHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 1 W (adjusted for tune-up tolerance) • at or above 20 MHz and below 48 MHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 4.49/ƒ0.5 W (adjusted for tune-up tolerance), where ƒ is in MHz • at or above 48 MHz and below 300 MHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 0.6 W (adjusted for tune-up tolerance) • at or above 300 MHz and below 6 GHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 1.31 × 10 −2
0.6834  (adjusted for tune-up tolerance), where ƒ is in MHz • at or above 6 GHz and the source-based, time-averaged maximum EIRP of the device is equal to or less than 5 W (adjusted for tune-up tolerance) In these cases, the information contained in the RF exposure technical brief may be limited to information that demonstrates how the EIRP was derived. Limit : 1.31 x 10 -2 x ƒ 0.6834 W (ƒ : 2 404.35 MHz)(2.678 W) 1.31 x 10 -2 x ƒ 0.6834 W (ƒ : 2 440.35 MHz)(2.706 W) CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com Page 3 of 3 [FCC] MPE calculation S = EIRP / (4πR 2 ) Where S : Power density (mW/cm 2 ) EIRP : P + T + G (dBm) P : Maximum transmitter power (dBm) G : Antenna gain (dBi) R : distance to the centre of radiation of the antenna (cm) T : Power tolerance (dB) Safety distance(R) : 20 cm EUT RF Exposure Mode Frequency [MHz] Calculation power [dBm] Antenna Gain [dBi] Power tolerance [dB] EIRP [dBm] Power density [mW/cm 2 ] Limit [mW/cm 2 ] ANT 0 2 440.35 17.383 2.7 + 2.0 22.083 0.032 1 ANT 1 2 404.35 16.607 2.7 + 2.0 21.307 0.027 1 Conclusion This confirms compliance to the required Radio frequency radiation exposure limit. [ISED] S = EIRP / (4πR 2 ) Where S : Power density (W/m 2 ) EIRP : P + T + G (dBm) P : Maximum transmitter power (dBm) G : Antenna gain (dBi) R : distance to the centre of radiation of the antenna (m) T : Power tolerance (dB) Safety distance(R) : 0.2 m Mode Frequency [MHz] Calculation power [dBm] Antenna Gain [dBi] Power tolerance [dB] EIRP [dBm] Power density [W/m 2 ] Limit [W/m 2 ] ANT 0 2 440.35 17.383 2.7 + 2.0 22.083 0.321 2.706 ANT 1 2 404.35 16.607 2.7 + 2.0 21.307 0.269 2.678 Conclusion This confirms compliance to the required Radio frequency radiation exposure limit.

Antenna Specification ATM610 Wireless Audio SRD Module, 2.4GHz 26.0 X 40.4 X 3.2 [mm], 24pin FFC Version : 01 1 /4 JULY 01, 2024 Antenna Specification Test Condition - ATM610 PCB Printed Antenna - Test Chamber : SJIT OTA Chamber - (Address : IoT R&D Center, 54‐11, Dongtanhana 1‐gil, Hwaseong‐si, Gyeonggi‐do, 18423 KOREA) - Network Analyzer : Return Loss - 3D Passive Chamber : Gain and Efficiency - Measured by Sungkwon Park 2024/07/01 Test Environment Antenna Specification ATM610 Wireless Audio SRD Module, 2.4GHz 26.0 X 40.4 X 3.2 [mm], 24pin FFC Version : 01 2 /4 JULY 01, 2024 Antenna Gain Measurement Procedure and Software The KSS Software is used to test antenna gain in the far field 3D OTA chamber. The overview of the far field 3D OTA chamber is shown in Fig.1 and the antenna turntable rotation sampling is shown in Fig.2. The antenna gain can be measured by the following steps 1. Place the AUT (Antenna Under Test) on the biaxial 3D turntable. 2. The test horn antenna maintains horizontal polarization, and the turntable rotation is controlled by the KSS test system and the value of each angular horizontal polarization of the AUT is read. 3. The test horn antenna maintains vertical polarization, and the turntable rotation is controlled by the KSS test system and the value of each angular vertical polarization of the AUT is read. 4. The KSS test system compares the obtained test values with the standard antenna to obtain the final gain values. Fig.1 Overview of 3D Chamber Fig.2 Antenna turntable rotation sampling Antenna Specification ATM610 Wireless Audio SRD Module, 2.4GHz 26.0 X 40.4 X 3.2 [mm], 24pin FFC Version : 01 3 /4 JULY 01, 2024 Measuring Instruments Item Measuring Instruments Latest Calibration Schedule 1 OTA Chamber 2024/06/10 2 Network Analyzer Agilent Technologies 5071C 2024/03/08 Antenna Characteristics Antenna Type PARAMETER CONDITION MIN TYP MAX UNIT Antenna0 Antenna1 PCB Printed Antenna Frequency Range 2400 2480 MHz Return Loss ANT0 ‐10 dB ANT1 ‐10 Peak Gain ANT0 2.7 dBi ANT1 2.7 Average Gain ANT0 ‐3.4 ‐2.6 dBi ANT1 ‐3.1 ‐2.6 Efficiency ANT0 46 55 % ANT1 48 55 % Impedance 50 Ω Antenna VSWR Tr1 : Antenna 0 Tr2: Antenna 1 Antenna Specification ATM610 Wireless Audio SRD Module, 2.4GHz 26.0 X 40.4 X 3.2 [mm], 24pin FFC Version : 01 4 /4 JULY 01, 2024 Antenna Efficiency & Gain Antenna0_Left Antenna1_Right

CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 Report No.: CTK-2024-02365 Page (45) / (88) Pages [QF-QP15-07] Ver.02 Project Number : CTK-R-2024-03591 Test mode : ANT 1 - Transmission status Lowest Frequency The requirements are: Complies Test Data : Frequency [MHz] (P) Reading PK [dB(uV)] C.f [dB(1/m)] Level PK [dB(uV/m)] Limit QP [dB(uV/m)] Margin QP-PK [dB] Height [cm] Angle [deg] Remark 30.776 H 28.3 -7.0 21.3 40.0 18.7 300.0 105.8 31.455 V 28.0 -7.3 20.7 40.0 19.3 200.0 0.8 95.960 H 35.8 -15.0 20.8 43.5 22.7 200.0 322.6 191.990 H 38.7 -15.2 23.5 43.5 20.0 100.1 348.9 971.385 H 25.7 5.8 31.5 54.0 22.5 100.1 156.0 998.739 V 26.7 5.5 32.2 54.0 21.8 300.1 228.1 Remark : 1. Measuring position : The Unwanted emission was measured in the following position: EUT stand-up position(Y axis), lie-down position(X,Z axis). The worst emission was found in stand-up position(Y axis) and the worst case was recorded. 2. Result = Reading + c.f(Correction factor) 3. Correction factor = Antenna factor + Cable loss + 6 dB attenuator - Amp Gain 4. This data is the Peak(PK) value. CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 Report No.: CTK-2024-02365 Page (46) / (88) Pages [QF-QP15-07] Ver.02 Project Number : CTK-R-2024-03591 Test mode : ANT 1 - Receiving, status Lowest Frequency The requirements are: Complies Test Data : Frequency [MHz] (P) Reading PK [dB(uV)] C.f [dB(1/m)] Level PK [dB(uV/m)] Limit QP [dB(uV/m)] Margin QP-PK [dB] Height [cm] Angle [deg] Remark 30.388 V 28.7 -6.9 21.8 40.0 18.2 100.0 349.5 31.164 H 28.0 -7.2 20.8 40.0 19.2 100.0 47.1 143.975 H 35.2 -12.8 22.4 43.5 21.1 200.0 295.2 191.990 H 37.3 -15.2 22.1 43.5 21.4 100.0 0.3 952.082 H 26.3 5.3 31.6 46.0 14.4 100.0 197.0 981.764 V 25.6 5.8 31.4 54.0 22.6 200.0 254.5 Remark : 1. Measuring position : The Unwanted emission was measured in the following position: EUT stand-up position(Y axis), lie-down position(X,Z axis). The worst emission was found in stand-up position(Y axis) and the worst case was recorded. 2. Result = Reading + c.f(Correction factor) 3. Correction factor = Antenna factor + Cable loss + 6 dB attenuator - Amp Gain 4. This data is the Peak(PK) value. CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 Report No.: CTK-2024-02365 Page (47) / (88) Pages [QF-QP15-07] Ver.02 Project Number : CTK-R-2024-03591 Test mode : ANT 1 - Transmission status Middle Frequency The requirements are: Complies Test Data : Frequency [MHz] (P) Reading PK [dB(uV)] C.f [dB(1/m)] Level PK [dB(uV/m)] Limit QP [dB(uV/m)] Margin QP-PK [dB] Height [cm] Angle [deg] Remark 30.291 V 28.0 -6.9 21.1 40.0 18.9 400.0 105.4 30.679 H 28.0 -7.0 21.0 40.0 19.0 300.0 250.5 95.960 H 39.9 -15.0 24.9 43.5 18.6 200.0 313.6 191.990 H 39.9 -15.2 24.7 43.5 18.8 100.0 359.9 944.128 V 27.3 4.9 32.2 46.0 13.8 400.0 0.4 962.267 H 26.5 5.7 32.2 54.0 21.8 200.0 13.3 Remark : 1. Measuring position : The Unwanted emission was measured in the following position: EUT stand-up position(Y axis), lie-down position(X,Z axis). The worst emission was found in stand-up position(Y axis) and the worst case was recorded. 2. Result = Reading + c.f(Correction factor) 3. Correction factor = Antenna factor + Cable loss + 6 dB attenuator - Amp Gain 4. This data is the Peak(PK) value. CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 Report No.: CTK-2024-02365 Page (48) / (88) Pages [QF-QP15-07] Ver.02 Project Number : CTK-R-2024-03591 Test mode : ANT 1 - Receiving, status Middle Frequency The requirements are: Complies Test Data : Frequency [MHz] (P) Reading PK [dB(uV)] C.f [dB(1/m)] Level PK [dB(uV/m)] Limit QP [dB(uV/m)] Margin QP-PK [dB] Height [cm] Angle [deg] Remark 30.582 H 28.1 -7.0 21.1 40.0 18.9 100.0 0.7 32.425 V 28.2 -7.8 20.4 40.0 19.6 200.0 54.4 143.975 H 35.3 -12.8 22.5 43.5 21.0 200.0 288.5 191.990 H 37.0 -15.2 21.8 43.5 21.7 100.0 5.3 961.103 H 26.1 5.7 31.8 54.0 22.2 100.0 99.1 975.362 V 26.0 5.9 31.9 54.0 22.1 100.0 355.8 Remark : 1. Measuring position : The Unwanted emission was measured in the following position: EUT stand-up position(Y axis), lie-down position(X,Z axis). The worst emission was found in stand-up position(Y axis) and the worst case was recorded. 2. Result = Reading + c.f(Correction factor) 3. Correction factor = Antenna factor + Cable loss + 6 dB attenuator - Amp Gain 4. This data is the Peak(PK) value. CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 Report No.: CTK-2024-02365 Page (49) / (88) Pages [QF-QP15-07] Ver.02 Project Number : CTK-R-2024-03591 Test mode : ANT 1 - Transmission status Highest Frequency The requirements are: Complies Test Data : Frequency [MHz] (P) Reading PK [dB(uV)] C.f [dB(1/m)] Level PK [dB(uV/m)] Limit QP [dB(uV/m)] Margin QP-PK [dB] Height [cm] Angle [deg] Remark 30.873 V 28.7 -7.1 21.6 40.0 18.4 99.9 90.0 31.261 H 29.3 -7.2 22.1 40.0 17.9 99.9 353.0 95.960 H 40.2 -15.0 25.2 43.5 18.3 200.0 310.6 191.990 H 39.8 -15.2 24.6 43.5 18.9 99.9 334.4 956.932 H 26.1 5.5 31.6 46.0 14.4 200.0 232.8 958.387 V 26.2 5.5 31.7 46.0 14.3 400.1 1.0 Remark : 1. Measuring position : The Unwanted emission was measured in the following position: EUT stand-up position(Y axis), lie-down position(X,Z axis). The worst emission was found in stand-up position(Y axis) and the worst case was recorded. 2. Result = Reading + c.f(Correction factor) 3. Correction factor = Antenna factor + Cable loss + 6 dB attenuator - Amp Gain 4. This data is the Peak(PK) value. CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 Report No.: CTK-2024-02365 Page (50) / (88) Pages [QF-QP15-07] Ver.02 Project Number : CTK-R-2024-03591 Test mode : AN…

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TEST REPORT CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 Report No.: CTK-2024-02365 Page (1) / (88) Pages [QF-QP15-07] Ver.02 Project Number : CTK-R-2024-03591 1. Applicant ◦ Name : SJIT Co.,Ltd ◦ Address : 54-11, Dongtanhana 1-gil, Hwaseong-si, Gyeonggi-do, Republic of Korea ◦ Date of Receipt : 2024-07-03 2. Manufacturer ◦ Name : SJIT Co.,Ltd ◦ Address : 54-11, Dongtanhana 1-gil, Hwaseong-si, Gyeonggi-do, Republic of Korea 3. Use of Report : For FCC & ISED Certification 4. Test Sample / Model : Audio Transceiver / ATM610 5. Date of Test : 2024-07-16 to 2024-08-20 6. Test Standard(method) used : FCC 47 CFR part 15 subpart C 15.247 ANSI C63.10-2013, ISED RSS-247 Issue 3 & JRSS-Gen Issue 5 7. Testing Environment : refer to 6 page 8. Test Results : Compliance 9. Location of Test : Permanent Testing Lab On Site Testing (Address : (Unhak-Dong) 5, Dongbu-ro 221beon-gil, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea) The results shown in this test report refer only to the sample(s) tested unless otherwise stated. This report cannot be reproduced or copied without the written consent of CTK. Approval Tested by Min-wook Jung: (Signature) Technical Manager Won-Jae, Hwang: (Signature) Remark. This report is not related to KOLAS accreditation and relevant regulation. 2024-08-XX CTK Co., Ltd. CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 Report No.: CTK-2024-02365 Page (2) / (88) Pages [QF-QP15-07] Ver.02 Project Number : CTK-R-2024-03591 REPORT REVISION HISTORY Date Revision Page No 2024-08-22 Issued (CTK-2024-02365) all This report shall not be reproduced except in full, without the written approval of CTK Co., Ltd. This document may be altered or revised by CTK Co., Ltd. personnel only, and shall be noted in the revision section of the document. Any alteration of this document not carried out by CTK Co., Ltd. will constitute fraud and shall nullify the document. CTK Co., Ltd. (Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 Report No.: CTK-2024-02365 Page (3) / (88) Pages [QF-QP15-07] Ver.02 Project Number : CTK-R-2024-03591 CONTENTS…

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