2A9UW-DBPE-23DearBuds PE

Got a question? We a r e h e r e t o h e l p y o u o u t . c s @ l i n k f a c e . c o How to use DearBuds PE D e a r B u d s P E i s a s t a n d a l o n e d e v i c e . Y o u m a y d o w n l o a d m o b i l e a p p s i f y o u w i s h t o a c c e s s a d d i t i o n a l f u n c t i o n s . H o w to installmobile apps S e a r c h f o r ‘DearBuds Connect’ in t h e A p p l e A p p S t o r e / G o o g l e P l a y S t o r e and i ns tal l it. H o w to connect A f t e r p o w e r i n g on, l a u n c h t h e D e a r B u d s C o n n e c t app o n c e t h e B l u e t o o t h i c o n bl i nks . (W h e n t h e c o n n e c t i o n i s s u c c e s s f u l , t h e B l u e t o o t h i c o n b l i n k s f i r s t a n d s t a ys o n . If t h e c o n n e c t i o n fails, pr e s s t h e r e s c a n button(+) to r e t r y t h e c o n n e c t i o n ) Main buttonFunctionButton P o w e r OnD o u b l e press P o w e r O f fLong pres s ( 2 s e c o nds ) M o d e C h a n g e (Auto, L1, L2, L3) P r e s s o n c e S t a r t d e h u m i d i f i c a t i on Q u i c k d o u b l e pres s Sub buttonFunctionButton C h a n gi n g t e m p e r a t u r e u n i t . D oubl e press (°F / °C) C h a n gi n g b r i g h t n e s s P r es s on c e (L1, L2, L3) Reset Lon g press (Fac tory res et) (10 s e c o n d s ) K e y F u n c t i o n s o f C o n t r o l B u t t o n s ModeSettingsRunning Time Auto (Autom oti ve m o d e ) W h en t h e ear h u m i d i t y r eac h es t h e op t i m al l evel , t h e d evi c e au t om a t i c al l y t u r n s of f . M i n -3 0 s ec on d s M ax -3 m i n u t es L1 (Soft m o d e ) For pets with sensitive hearing3 minut es L2 ( N o r m a l m o d e ) A f t er phys ic al ac t ivi t y or s how er i n g3 minut es S (Standb y m o d e ) Only measurement, no ventilation3 minut es ※A i r v e n t i l a t i o n p o w e r i s h i g h e r w i t h t h e s t r e n g t h o f t h e m o d e . M o d e s a n d R u n n i n g T i m e 1888 65 1 2 3 4 1.C h a r g i n gicon *blinks when it needs charging red when charging green when f ully charged. 2.Bl u et o o t hicon *blinks while connec ting with the app *light stays on once connect ing is complet ed. 3.Deh u mi d i f i cat i o nicon *shows up during dehumidif ication. 4.“ %” icon : p er c en t a g e of h u m i d i t y/ b a t t e r y ( W h e n % i s n o t o n d i s p l a y , i t s h o w s a t e m p e r a t u r e . ) 5. S t at u sicon 1)“Dehumidification” blinks 2)“Temperature Measurement” blinks 3)“Too humid” blinks 4)When “Dehumidification” is completed, b l i n k s Scan Here S p e c i f i c a t i o n W e i g h t D e a r B u d s PE (50g), C h a r g i n g C r a d l e (65g) L E D Red LED, IR LED H e a t M a x 3 8°C A i r D e l i v e r y M a x 3 L / m i n C o n n e c t i v i t y W i r el ess 2. 4G Hz S e n s o r s H i g h p e r f o r m a n c e h u m i di t y sensor , 3 e m b e d d e d t em p er a t u r e s en s o rs B a t t e r yM a x 6 0 t i m e s i n l o w p o w e r m o d e ( L 1 ) , 2 h o u r s f o r a f u l l c h a r g e . C o m p a n y N a m e : Li nkf ace Co., Ltd. M o d el : D e a r B u d s PE M o d el No.: DBPE-23 M a n u f ac t ur e: Li nkf ace Co., Ltd. / Republ i c of K o r ea W eb s i t e: w w w . l i nk f ace. co F o r m o r e d e t a i l e d i n s t r u c t i o n s a n d F A Q s , p l e a s e c h e c k t h e o n l i n e m a n u a l . Online Manual 2A9UW-DBPE-23

Attestation Statements (31 October, 2023) TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA RE: Attestation Statements Part 2.911(d)(7) request for (2A9UW-DBPE-23) (Linkface Co., Ltd. ), the undersigned, hereby authorize (GAZELAB, INC.) to act as our designated U.S. agent for service of process, (Linkface Co., Ltd.) accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. (GAZELAB, INC.) accepts the responsibility to act as designated U.S. agent for service of process. Applicant Information： Company name: Linkface Co., Ltd. Contact Name: Kyungsoo Lim Address: 501-ho, 11, Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea FRN: 0033221540 Telephone No: +82 10 9344-8206 Email: [email protected] Kyungsoo Lim/ CEO U.S. Agent Information: Company Name: GAZELAB, INC. Address: 4720 E. 26th street, VERNON, CA 90058, USA FRN: 0034457960 Contact Name: JAROD LEE Telephone No: +1 310 561 9210 Email: [email protected] JAROD LEE/ Staff

Linkface Co., Ltd. 31 October, 2023 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for (2A9UW-DBPE-23) [Linkface 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, Kyungsoo Lim/ CEO Linkface Co., Ltd 31 October, 2023 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for (2A9UW-DBPE-23) [Linkface 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, Kyungsoo Lim/ CEO

Linkface Co., Ltd. 501-ho, 11, Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea Date: Oct 31, 2023 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (DearBuds PE/DBPE-23/2A9UW-DBPE- 23) 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 (below list) required to be submitted with this application be permanently withheld from public review. Permanent Confidential Request -. Schematics -. Block Diagram -. Operational Description SPECIFY REASON FOR REQUEST (i.e. 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, Kyungsoo Lim/ CEO

Linkface Co., Ltd. 501-ho, 11, Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea Date: Oct 31, 2023 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (DearBuds PE/DBPE-23/2A9UW-DBPE- 23) 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 (below list) required to be submitted with this application be short-term Confidentiality for a period of 180 days after grant is issued. Short-Term Confidential Request -. External Photos -. Internal Photos -. Test set-up photo -. User Manual SPECIFY REASON FOR REQUEST (i.e. These documents contain detailed system and equipment descriptions and related information about the product, which we considers to be proprietary, confidential, and a custom design and otherwise, would not release to the general public. Since this design is a basis from which future technological products will evolve, we feel that this information would be of benefit to our competitors, and that the disclosure of the information in these documents would give our competitors an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Kyungsoo Lim/ CEO

Linkface Co., Ltd. 501-ho, 11, Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea Date: 31 October, 2023 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Ms. Hyowon Jeong/Staff of Eurofins KCTL 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, Sincerely, Kyungsoo Lim/ CEO

This document shall not be reproduced, except in full, without the written approval External photos of EUT This document shall not be reproduced, except in full, without the written approval This document shall not be reproduced, except in full, without the written approval

Device Bottom ■Label info. & Location MODEL No. :DBPE-23 FCC ID : 2A9UW-DBPE-23 KC ID : R-R-LFc-DBPE-23 MADE BY LINKFACE IN KOREA MODEL No. :DBPE-23 FCC ID : 2A9UW-DBPE-23 KC ID : R-R-LFc-DBPE-23 Button

This document shall not be reproduced, except in full, without the written approval Internal photos of EUT This document shall not be reproduced, except in full, without the written approval Chip Antenna This document shall not be reproduced, except in full, without the written approval This document shall not be reproduced, except in full, without the written approval

This test report shall not be reproduced, except in full, without the written approval * RF Exposure FCC ID: 2A9UW-DBPE-23 1. Regulation According to the KDB 447498 D01 V06, the following RF exposure evaluation shall to demonstrate RF exposure compliance. Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. These test exclusion conditions are based on source-based time-averaged maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up tolerance, and the minimum test separation distance required for the exposure conditions. The minimum test separation distance defined in 4.1 f) is determined by the smallest distance from the antenna and radiating structures or outer surface of the device, according to the host form factor, exposure conditions and platform requirements, to any part of the body or extremity of a user or bystander. To qualify for SAR test exclusion, the test separation distances applied must be fully explained and justified, typically in the SAR measurement or SAR analysis report, by the operating configurations and exposure conditions of the transmitter and applicable host platform requirements, according to the required published RF exposure KDB procedures. When no other RF exposure testing or reporting are required, a statement of justification and compliance must be included in the equipment approval, in lieu of the SAR report, to qualify for SAR test exclusion. When required, the device specific conditions described in the other published RF exposure KDB procedures must be satisfied before applying these SAR test exclusion provisions; for example, handheld PTT two-way radios, handsets, laptops and tablets, etc. a) For 100 ㎒ to 6 ㎓ and test separation distances ≤ 50 ㎜, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(max. power of channel, including tune-up tolerance, ㎽) / (min. test separation distance, ㎜)] · [√f(㎓)] ≤ 3.0 for 1-g SAR, and ≤ 7.5 for 10-g extremity SAR,30 where ● f(㎓) is the RF channel transmit frequency in ㎓ ● Power and distance are rounded to the nearest ㎽ and mm before calculation ● The result is rounded to one decimal place for comparison ● The values 3.0 and 7.5 are referred to as numeric thresholds in step b) below The test exclusions are applicable only when the minimum test separation distance is ≤ 50 ㎜, and for transmission frequencies between 100 ㎒ and 6 ㎓. When the minimum test separation distance is < 5 ㎜, a distance of 5 ㎜ according to 4.1 f) is applied to determine SAR test exclusion. b) For 100 ㎒ to 6 ㎓ and test separation distances > 50 ㎜, the 1-g and 10-g SAR test exclusion thresholds are determined by the following (also illustrated in Appendix B): 1) {[Power allowed at numeric threshold for 50 ㎜ in step a)] + [(test separation distance – 50 ㎜)·(f(㎒)/150)]} ㎽, for 100 ㎒ to 1500 ㎒ 2) {[Power allowed at numeric threshold for 50 ㎜ in step a)] + [(test separation distance – 50 ㎜)·10]} ㎽, for > 1500 ㎒ and ≤ 6 ㎓ c) For frequencies below 100 ㎒, the following may be considered for SAR test exclusion (also illustrated This test report shall not be reproduced, except in full, without the written approval in Appendix C): 1) For test separation distances > 50 ㎜ and < 200 ㎜, the power threshold at the corresponding test separation distance at 100 ㎒ in step b) is multiplied by [1 + log(100/f(㎒))] 2) For test separation distances ≤ 50 ㎜, the power threshold determined by the equation in c) 1) for 50 ㎜ and 100 ㎒ is multiplied by ½ 3) SAR measurement procedures are not established below 100 ㎒. When SAR test exclusion cannot be applied, a KDB inquiry is required to determine SAR evaluation requirements for any SAR test results below 100 ㎒ to be acceptable. 2. Result 2-1. Calculation Result of RF Exposure Mode Test frequency [㎒] Max. tune-up Power [㏈m] Conducted output power [㎽] Min. test separation distance [㎜] SAR test exclusion thresholds ≤ 7.5 for 10-g SAR BLE/1 Mbps 2 480 -7.50 0.18 5.00 0.06 Note: 1. SAR test exclusion thresholds = [(max. power of channel, including tune-up tolerance, ㎽)/(min. test separation distance, ㎜)] · [√f(㎓)] = [(0.18)/(5.0)] · [√2.480] = 0.06 3. Target power and tolerance, Max tuneup power Mode Test frequency [㎒] Target power [㏈m] Max tuneup power [㏈m] Measured average Power [㏈m] Bluetooth LE_1 Mbps 2402 -8.5 -7.5 -9.27 2440 -8.5 -7.5 -8.96 2480 -8.5 -7.5 -8.70 4. RF Exposure Compliance Issue Therefore, EUT is not required the SAR Evaluation.

Detail Specification: Page 1 of 10 Chip Antenna Mechanical Dimensions ±± W ±± T a ±± www.johansontechnology.com 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 1.3 2017 Johanson Technology, Inc. All Rights Reserved 0.10 100% Tin Packing Style 0.063 Function No. Terminal Configuration 1.600.004 Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 0.0040.031 0.016 0.010 0.80 1 2 FEED NC 0.25 max.0.40 0.004 0.10 0.10 max. P/N Suffix Part Number Explanation Evaluation Board 2450AT14A0100-EB1SMA & 2450AT14A0100-EB2SMA see pages 2&6 for details Bulk (loose) T & R Suffix = T or S Suffix = Te.g. 2450AT14A0100T (4,000pcs/reel) e.g. 2450AT14A0100SSuffix = S L mmIn e.g. 2450AT14A0100(T or S) Storage Temperature Operating Temperature Reel Quantity "High Frequency Ceramic Solutions" P/N 2450AT14A0100 Let us help you with the antenna design (free), optimization, and tuning (small fee may apply) 2/8/2018 2.4 GHz Mini Chip Antenna for 802.11, WiFi, WLAN, IoT with Small Area and GND size, ultra low profile 2450AT14A0100 48% -0.5 dBi typ. (XZ-Total) General Specifications Part Number Frequency (GHz) Avg. Rad Efficiency 1 Peak Gain 1 (dBi typ.) 2.4 - 2.48 Average Gain (dBi typ.)-2.0 dBi typ. (XZ-Total) 9.5 Typ. (6 min.) 50 Ω 2 Watts max. (CW) Return Loss (dB) Impedance Input Power 4000 -40 to +85°C -40 to +85°C Recommended Storage Conditions of unused product on T&R and period +5 to +35°C, Humidity 45~75%RH, 18 months max. L a W   T Top Side AEC-Q200 qualification available. 1 Measured on 2450AT14A0100-EB2SMA Contact our RF Engineers at: www.johansontechnology.com/ask-a-question for any questions you have, including tips or help on tuning the antenna www.johansontechnology.com/ask-a-question P/N 2450AT14A0100 Detail Specification: Page 2 of 10 www.johansontechnology.com 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 1.3 2017 Johanson Technology, Inc. All Rights Reserved Mounting Considerations 1: Evaluation Board (small PCB) Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. "High Frequency Ceramic Solutions" 2/8/2018 2.4 GHz Mini Chip Antenna for 802.11, WiFi, WLAN, IoT with Small Area and GND size, ultra low profile GND 15mm 17mm 5mm No Ground 7mm 50W Feed Line 22mm To order a pre-tuned 50Ω EVB like the above with a female SMA connector click here: www.johansontechnology.com/request-a-sample Reference p/n: 2450AT14A0100-EB1SMA Would you like the layout file of the above? Having antenna tuning issues? Contact us by clicking on the link below (we're fast to respond!) . If you have any questions regarding the implementation of this antenna in your PCB, we'll be happy to guide you to maximize the antenna's performance. Contact our applications engineers at: www.johansontechnology.com/ask-a-question Detailed layout measurements, pad sizes, pattern geometry, etc. on the next page P/N 2450AT14A0100 Detail Specification: Page 3 of 10 Mount these devices with red mark facing up. www.johansontechnology.com 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 1.3 2017 Johanson Technology, Inc. All Rights Reserved "High Frequency Ceramic Solutions" 2/8/2018 Mounting Considerations 1: Antenna Footprint Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. 2.4 GHz Mini Chip Antenna for 802.11, WiFi, WLAN, IoT with Small Area and GND size, ultra low profile 8.2pF 1.5nH 0.8mm 0.5mm 5.2mm 1.1mm 2.4mm Matching circuit ("pi" matching topology recommended) 0.85mm 0.65mm 2.0mm 0.5mm 0.8mm 1.43mm 0.55mm (Matching circuit and component values will be different, depending on PCB layout) Antenna Reference Layout Land Solder Resist P/N 2450AT14A0100 Detail Specification: Page 4 of 10 www.johansontechnology.com 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 1.3 2017 Johanson Technology, Inc. All Rights Reserved Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. "High Frequency Ceramic Solutions" 2/8/2018 Mounting Considerations 1: Typical Electrical Performance (T=25°C) 2.4 GHz Mini Chip Antenna for 802.11, WiFi, WLAN, IoT with Small Area and GND size, ultra low profile 2.2 2.4 2.6 2.8 2.0 3.0 -25 -20 -15 -10 -5 -30 0 freq, GHz dB(S(1,1)) Readout m1 Readout m2 Readout m3 m1 freq= dB(S(1,1))=-11.802 2.480GHz m2 freq= dB(S(1,1))=-7.237 2.400GHz m3 freq= dB(S(1,1))=-19.172 2.440GHz P/N 2450AT14A0100 Detail Specification: Page 5 of 10 www.johansontechnology.com 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 1.3 2017 Johanson Technology, Inc. All Rights Reserved "High Frequency Ceramic Solutions" Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. Mounting Considerations 1: Typical EM Radiation Performance @ 2.44GHz (T=25°C) 2/8/2018 2.4 GHz Mini Chip Antenna for 802.11, WiFi, WLAN, IoT with Small Area and GND size, ultra low profile ) ) ) ) ) ) ) ) ) Y :Φ(Phi)=90 o X :Φ(Phi)=0 o Z : θ(Theta)=0 o XY-plane @2.44 GHz Total XZ-plane @2.44 GHz Total YZ-plane @2.44 GHz Total P/N 2450AT14A0100 Detail Specification: Page 6 of 10 www.johansontechnology.com 4001 Calle Tecate • Camarillo, CA 93012 • TEL 805.389.1166 FAX 805.389.1821 Ver. 1.3 2017 Johanson Technology, Inc. All Rights Reserved "High Frequency Ceramic Solutions" 2/8/2018 Mounting Considerations 2: Evaluation Board (larger PCB) Johanson Technology, Inc. reserves the right to make design changes without notice. All sales are subject to Johanson Technology, Inc. terms and conditions. Frequency (GHz)Radiated E…

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verify No.937915238893 Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-5008-1021 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR23-SRF0273 Page (2) of (32) KCTL-TIR001-003/7 (220705) KP23-04986 REPORT REVISION HISTORY Date Revision Page No 2023-12-22 Originally issued - This report shall not be reproduced except in full, without the written approval of Eurofins KCTL Co.,Ltd. This document may be altered or revised by Eurofins KCTL Co.,Ltd. personnel only, and shall be noted in the revision section of the document. Any alteration of this document not carried out by Eurofins KCTL Co.,Ltd. will constitute fraud and shall nullify the document. This test report is a general report that does not use the KOLAS accreditation mark and is not related to KS Q ISO/IEC 17025 and KOLAS accreditation. General remarks for test reports Statement concerning the uncertainty of the measurement systems used for the tests (may be required by the product standard or client) Internal procedure used for type testing through which traceability of the measuring uncertainty has been established: Procedure number, issue date and title: Calculations leading to the reported values are on file with the testing laboratory that conducted the testing. Statement not required by the standard or client used for type testing Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-5008-1021 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR23-SRF0273 Page (3) of (32) KCTL-TIR001-003/7 (220705) KP23-04986 CONTENTS 1. General information ......................................................................................................4 2. Device information ........................................................................................................4 2.1 Frequency/channel operations ...............................................................................5 2.2. Duty Cycle Factor ...................................................................................................5 2.3. RF power setting in TEST SW .................................................................................5 3. Antenna requirement ....................................................................................................6 4. Summary of tests ..........................................................................................................7 5. Measurement uncertainty .............................................................................................8 6. Measurement results explanation example ..................................................................9 7. Test results ................................................................................................................. 10 7.1. Maximum Peak Output Power .............................................................................. 10 7.2. Peak Power Spectral Density ............................................................................... 13 7.3. 6 ㏈ Bandwidth(DTS Channel Bandwidth) .......................................................... 15 7.4. Spurious Emission, Band Edge and Restricted bands .......................................... 17 7.5. Conducted Spurious Emission .............................................................................. 30 8. Measurement equipment ............................................................................................ 32 Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-5008-1021 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR23-SRF0273 Page (4) of (32) KCTL-TIR001-003/7 (220705) KP23-04986 1. General information Client : Linkface Co., Ltd. Address : 501-ho, 11, Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea Manufacturer : Linkface Co., Ltd. Address : 501-ho, 11, Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea Laboratory : Eurofins KCTL Co.,Ltd. Address : 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea Accreditations : FCC Site Designation No: KR0040, FCC Site Registration No: 687132 VCCI Registration No. : R-20080, G-20078, C-20059, T-20056 CAB Identifier: KR0040 ISED Number: 8035A KOLAS No.: KT231 2. Device information Equipment under test : DearBuds PE Model : DBPE-23 Modulation technique : GFSK Number of channels : 40 ch Power source : DC 3.7 V Antenna specification : Chip Antenna Antenna gain : -0.5 ㏈i Frequency range : 2 402 ㎒ ~ 2 480 ㎒ Software version : SW ver1 Hardware version : HW ver2 Test device serial No. : 0033221540 Operation temperature : -10 °C ~ 50 °C Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-5008-1021 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR23-SRF0273 Page (5) of (32) KCTL-TIR001-003/7 (220705) KP23-04986 2.1 Frequency/channel operations This device contains the following capabilities: Bluetooth Low Energy Ch. Frequency (㎒) 00 2 402 . . . . 19 2 440 . . . . 39 2 480 Table 2.1.1. Bluetooth Low Energy 2.2. Duty Cycle Factor Test mode Period (ms) On time (ms) Duty cycle Duty Cycle Factor (dB) (Linear) (%) 1M Bits/s, 37 Packet 0.625 2 0.395 4 0.632 4 63.24 1.99 Notes. 1. Duty cycle (Linear) = T on time / Period 2. DCF(Duty cycle factor) = 10log(1/duty cycle) 3. DCF is not compensated to average result if the duty cycle is more than 98% 1M Bits/s, 37 Packet 2.3. RF power setting in TEST SW Ch. Frequency (㎒) RF Power setting value Software Program 1Mbps / 37packet 2 402 -8 dBm nRF Connect 2 440 2 480 Eurofins KCTL Co.,Ltd. 65, Sinwon-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16677, Korea TEL: 82-70-5008-1021 FAX: 82-505-299-8311 www.kctl.co.kr Report No.: KR23-SRF0273 Page (6) of (32) KCTL-TIR001-003/7 (220705) KP23-04986 3. Antenna requirement Requirement of FCC part section 15.203: An intentional radiator shall be designed to ensure that no antenna other than that furnished by the responsible part…

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This document shall not be reproduced, except in full, without the written approval Test setup photos - Below 30 ㎒ (9㎑ ~ 30 ㎒) - Below 1 ㎓ (30 ㎒ ~ 1 ㎓) This document shall not be reproduced, except in full, without the written approval - Above 1 ㎓ (1 ㎓ ~ 18 ㎓) - Above 18 ㎓ (18 ㎓ ~ 26.5 ㎓) This document shall not be reproduced, except in full, without the written approval - Conducted Emission