2BCKX-GT4PLUSSmart Watch

Sports smart watch Thank you for choosing our smart watch. You can read this manual to fully understand how to use the device. This device is mainly connected to the mobile phone through Bluetooth for adaptation and use. It provides a variety of practical functions and services to facilitate your operation of the mobile phone. Human movement and health functions. The company reserves the right to modify the contents of this manual without any prior notice without notice This product supports IP68 waterproof, the application scenario supports rain, hand washing and other daily waterproof, swimming is not recommended to wear, hot shower or sauna, etc., can not prevent water vapor. If the watch is damaged due to water ingress due to failure to follow the instructions, our company will not provide free warranty. Operating instructions: Side button function： 1. Up button: Function button: Single press to enter Gypsophila; when in other application interface, single press to return to the upper level interface; Double-press to switch menu style on menu interface; 2. Down button: long press to switch the machine; single press on the dial interface to turn on and off the screen, other interfaces return to the dial interface with one key; Touch gesture:Double-click on the dial interface to enter the SIRI interface; swipe left to switch to the component interface; swipe right to enter the split-screen UI; swipe down to enter the control center; swipe up to enter information; after entering each function, swipe right to return. Dial switch: The rotary encoder switches the dial. Strap replacement: Pull forward with one hand, and push forward with the other hand at the same time, the strap can be easily disassembled; Charging instructions: It supports wireless charging. Horizontal and vertical charging screen: When connected to the power supply and placed horizontally or vertically, the bedside clock interface will be displayed. Connection between watch and mobile phone: First, the mobile phone must download the APP "RDFit" to the mobile phone and install it in two ways。 1.IOS/Android phone user： Scan the QR code below through the mobile browser, or scan it with WeChat. When the interface is opened, click the Android/iOS download option and choose to open the download with the mobile browser. The QR code in the figure below is the RDFit APP download Android/iOS 2 2.For Android phones, search for "RDFit" and download in App Store, Google Play, and various mobile app stores, and for Apple phones, search for "RDFit" and download on the App Store. Simple handling methods for common problems: Since the Bluetooth protocol of each mobile phone brand is not uniform, sometimes the Bluetooth connection between the mobile phone and the watch may be unstable. You can turn off the Bluetooth of the mobile phone and reconnect it again, or restore the watch to the factory settings. How to set the notifications： Mobile phone enters settings-application management, find "RDFit"-permission management, open all. Then enter the notification management-find all the permissions of "RDFit" to open. Open "RDFit"-more-application push-open the background running permission, enter the option without restrictions. When you return, you will be prompted to open the auto-start again and enter the open. Go back, select the APP for synchronization information notification, such as QQ WeChat, and select Open. What should I do if I do not receive the notification? First of all, the notification function of the watch is only to synchronize the notification function of the mobile phone, such as incoming call and letter, QQ WeChat letter reminder, if your mobile phone does not receive the notification, then the watch will not receive it. You should find the corresponding APP in the phone settings-notification function , Turn on the permission notification. Main function introduction: Encoder:The dial button on the standby interface can switch the dial, and it can slide up and down in the secondary menu; the gypsophila style menu can be zoomed in and out， After the interface is maximized, you can enter the application in the middle of the interface. Split Screen:Swipe right on the dial interface to enter the split screen function, and you can quickly enter the corresponding function; Watch face push:It can push APP-side pointer dials, digital dials and custom dials. Alipay:Follow the prompts to use Android or Apple mobile phones, open Alipay and scan the QR code to bind. Dialpad:Connect the mobile phone to make a call, and the call can be realized on the watch side. call records:It can synchronize the call records of the mobile phone. Phone book:You can add 20 contacts to the phone book of the watch through the APP Pedometer:You can view the number of steps in a day, historical steps, calorie consumption and walking distance of the day. After 24 o'clock every night, the data of the day will be stored as historical data, and the interface data will be reset to 0. information:View the messages pushed on the mobile terminal, support facebook, twitter, whatsapp, qq, WeChat, etc. Heart rate:Put the watch close to your wrist, and the best place to wear it is the wrist bone above your arm. The real-time heart rate can be measured. The normal range is 60-90 beats/min. Blood oxygen:The measurement starts when you enter it. Please keep your arm at rest during measurement, and the value will be measured after about 20 seconds. blood pressure:The monitoring starts when you enter it. When monitoring, please lay your hands flat, and the value will be measured after about 12 seconds. Alarm:Five alarm clocks can be synchronized through the APP; The watch can also set an alarm clock. Sleep monitoring:The sleep duration and sleep quality from 21:00 on the same day to 9 a.m. the next day will be recorded to help better adjust personal work and rest time and improve sleep quality. Sleep data can be viewed simultaneously by connecting to the APP. sports:The w…

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Covered Equipment Attestation Letter For Certification Service in the USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Section 2.911(d)(5)(i)-(ii) of the Commission’s Rules (47 C.F.R.) we attest as follows for the product listed below: FCC ID Model name 2BCKX-GT4PLUS GT4PLUS We, applicant Company Name: Shenzhen Dewanghong Technology Co. LTD Address: 605-606, Building E, Longjing Science Park, No.339 Bulong Road, Longgang District, Shenzhen Phone: 18682236302 certify 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. We certify 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. If you have any questions, please feel free to contact us at the address shown below. Sincerely, Apr.28,2024 Signature Date Printed Name of Signee: zhangjiali Company: Shenzhen Daiku Technology Co., Ltd. Address: 605-606, Building E, Longjing Science Park, No.339 Bulong Road, Longgang District, Shenzhen Phone: 18682236302 Email: [email protected]

Local Representative Letter For Certification Service in the USA Federal Communications Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Section 2.911(d)(7), of the Commission’s Rules (47 C.F.R.) we attest as follows for the product listed below: FCC ID Model name 2BCKX-GT4PLUS GT4PLUS We hereby acknowledge as follows: i. both signees confirm that the point of contact accepts responsibility to act as a US- American Representative on behalf of the applicant ii. the point of contact provides the physical U.S. address and email as listed below iii. both parties maintain the requirements of this agreement 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. US-American Point of Contact Applicant/Approval Holder Company Name: GSS SERVICE INC Shenzhen Daiku Technology Co., Ltd. FRN: 0033500653 0033896796 Contact Name: Michoux Logan zhangjiali Address: 6547 N Academy Blvd #2266 Colorado Springs Co 80918 USA 605-606, Building E, Longjing Science Park, No.339 Bulong Road, Longgang District, Shenzhen Phone: 001-949-2990192 or 001-515- 7158284 18682236302 Email: [email protected] [email protected]

Confidentiality Request Letter For Certification Service in the USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21048 To whom it may concern Pursuant to Paragraphs §0.457 and 0.459 of the Commission’s Rules (47 C.F.R.) and Section §552(b)(4) of the Freedom of Information Act, we request confidentiality for the documentation of the following products: FCC ID Model name 2BCKX-GT4PLUS GT4PLUS For the products listed above, we request permanent confidentiality for all applicable exhibits as there are: • the Operational Description • the Block Diagram • the Schematics The above listed exhibits contain trade secrets and proprietary information that could be of benefit to our competitors. If you have any questions, please feel free to contact us at the address shown below. Sincerely, Apr.28,2024 Signature Date Printed Name of Signee: zhangjiali /Manager Company: Shenzhen Daiku Technology Co., Ltd. Address: 605-606, Building E, Longjing Science Park, No.339 Bulong Road, Longgang District, Shenzhen Phone: 18682236302 Fax: Email: [email protected]

External Photographs FCC ID: 2BCKX-GT4PLUS

Label Sample for FCC ID: 2BCKX-GT4PLUS Size for the label: 8mm X 16mm Product Name : Smart Watch Model :GT4PLUS FCC ID :2BCKX-GT4PLUS

Internal photographs FCC ID: 2BCKX-GT4PLUS Antenna

Radio frequency radiation exposure evaluation: portable devices 1.1 Radio Frequency Exposure Compliance 1.1.1 Electromagnetic Fields RESULT: Pass Test Specification Test item : Smart Watch Identification / Type No. : GT4PLUS FCC ID : 2BCKX-GT4PLUS Test standard : CFR47 FCC Part 2: Section 2.1093 FCC KDB Publication 447498 v06 For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(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 • 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 mm, and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 4.1 f) is applied to determine SAR test exclusion. Measurement Record: EIRP[dBm] = maximum peak output + antenna Gain =1.47dBm + 1.49dBi =2.96dBm Since maximum peak output power of the transmitter is 2.96dBm ≈1.98mW < 10mW. Hence the EUT is excluded from SAR evaluation according to FCC KDB Publication 447498 D01 General RF Exposure Guidance v06.

Shenzhen Daiku Technology Co., Ltd. 605-606, Building E, Longjing Science Park, No.339 Bulong Road, Longgang District, Shenzhen1 Shenzhen Daiku Technology Co., Ltd. Antenna SPECIFICATION Product picture: Specifications: Item Specification type copper core Model GT4PLUS length 20mm diameter 0.65mm Frequency Range 2.4-2.5GHZ Gain 1.49dBi Manufacturer Shenzhen Daiku Technology Co., Ltd Address 605-606, Building E, Longjing Science Park, No.339 Bulong Road, Longgang District, Shenzhen Technical parameter diagram for passive test:

BSL Testing Co.,LTD. Report No.: BSL240404175006RF Report No.: BSL240404175006RF Page 1 of 48 FCC Part 15.247 FCC Part 15C Measurement and Test Report For Shenzhen Daiku technology Co., LTD FCC ID:2BCKX-GT4PLUS FCC Rule(s): FCC Part 15.247 Product Description: Smart Watch Tested Model: GT4PLUS Report No.: BSL240404175006RF Tested Date: Apr.11~Sep.09,2024 Issued Date: Sep.09,2024 Tested By: Cindy Zheng / Engineer Reviewed By: Haley Wen / EMC Manager Approved & Authorized By: Mike Mo / PSQ Manager Prepared By: BSL Testing Co.,LTD. 1/F, Building B, Xinshidai GR Park, Shiyan Street, Bao'an District, Shenzhen, ShiyanStreet, Bao'an District, Shenzhen,Guangdong,518052,People’s Republic of China Tel: 400-882-9628 Fax: 86- 755-26508703 BSL Testing Co.,LTD. Report No.: BSL240404175006RF Report No.: BSL240404175006RF Page 2 of 48 FCC Part 15.247 TABLE OF CONTENTS 1. GENERAL INFORMATION ................................................................................................................................... 3 1.1 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ............................................................................... 3 1.2 EUT SETUP AND TEST MODE ................................................................................................................................. 5 1.3 TEST STANDARDS ................................................................................................................................................... 5 1.4 TEST METHODOLOGY ............................................................................................................................................. 5 1.5 TEST FACILITY ....................................................................................................................................................... 5 1.6 MEASUREMENT UNCERTAINTY .............................................................................................................................. 6 1.7 TEST EQUIPMENT LIST AND DETAILS ..................................................................................................................... 6 3. RF EXPOSURE ......................................................................................................................................................... 7 3.1 STANDARD APPLICABLE ......................................................................................................................................... 7 3.2 TEST RESULT.......................................................................................................................................................... 7 4. ANTENNA REQUIREMENT .................................................................................................................................. 8 4.1 STANDARD APPLICABLE ......................................................................................................................................... 8 4.2 EVALUATION INFORMATION .................................................................................................................................. 8 5. CONDUCTED EMISSIONS .................................................................................................................................... 9 6. 20DB EMISSION BANDWIDTH .......................................................................................................................... 11 7. CARRIER FREQUENCIES SEPARATION ........................................................................................................ 18 8. HOPPING CHANNEL NUMBER ......................................................................................................................... 21 9. DWELL TIME ........................................................................................................................................................ 24 10. PSEUDORANDOM FREQUENCY HOPPING SEQUENCE .......................................................................... 27 11. BAND EDGE .......................................................................................................................................................... 28 12. SPURIOUS EMISSION ........................................................................................................................................ 38 BSL Testing Co.,LTD. Report No.: BSL240404175006RF Report No.: BSL240404175006RF Page 3 of 48 FCC Part 15.247 1. GENERAL INFORMATION 1.1 Product Description for Equipment Under Test (EUT) Applicant: Shenzhen Daiku technology Co., LTD Address of applicant: 605-606, Building E, Longjing Science Park, 339 Bulong Road, Longgang District, Shenzhen Manufacturer: Shenzhen Daiku technology Co., LTD Address of manufacturer: 605-606, Building E, Longjing Science Park, 339 Bulong Road, Longgang District, Shenzhen Product Name: Smart Watch Model No.: GT4PLUS Test Model No: GT4PLUS Quantity of tested samples 1 Serial No.: N/A Operation Frequency: 2402MHz~2480MHz Channel numbers: 79 Channel separation: 1MHz Modulation type: GFSK,Pi/4 QPSK,8DPSK Antenna Type: Cable Antenna Antenna gain: 1.49dBi Power supply: DC 3.7V by battery BSL Testing Co.,LTD. Report No.: BSL240404175006RF Report No.: BSL240404175006RF Page 4 of 48 FCC Part 15.247 Operation Frequency each of channel Channel Frequency Channel Frequency Channel Frequency Channel Frequency 1 2402MHz 21 2422MHz 41 2442MHz 61 2462MHz 2 2403MHz 22 2423MHz 42 2443MHz 62 2463MHz 3 2404MHz 23 2424MHz 43 2444MHz 63 2464MHz 4 2405MHz 24 2425MHz 44 2445MHz 64 2465MHz 5 2406MHz 25 2426MHz 45 2446MHz 65 2466MHz 6 2407MHz 26 2427MHz 46 2447MHz 66 2467MHz 7 2408MHz 27 2428MHz 47 2448MHz 67 2468MHz 8 2409MHz 28 2429MHz 48 2449MHz 68 2469MHz 9 2410MHz 29 2430MHz 49 2450MHz 69 2470MHz 10 2411MHz 30 2431MHz 50 2451MHz 70 2471MHz 11 2412MHz 31 2432MHz 51 2452MHz 71 2472MHz 12 2413MHz 32 2433MHz 52 2453MHz 72 2473MHz 13 2414MHz 33 2434MHz 53 2454MHz 73 2474MHz 14 2415MHz 34 2435MHz 54 2455MHz 74 2475…

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Test Setup Photos FCC ID: 2BCKX-GT4PLUS