Features: 1. Function: clear call / precise positioning / long battery life / ultra-thin body / cool and wear-resistant 2. 14.1mm ultra-thin process design, light and thin like home The whole machine is beautiful in color and rich in texture, which is always the envy of other Adult. 3. Two-way clear and stable call The sound is louder and can be heard in noisy environAdultts. Unique antenna design, multiple calibrations to ensure stable communication 4. Voice chat, communication is more convenient Simpler operation and clearer voice Easy group chat, support multi-phone chat Small flashlight, you can watch in the dark 5. Accurate positioning, real-time visualization Accurately record every corner of the child to fully meet the needs of life positioning and emergency situations 6. Electronic fence, always protect the safety of Adult Define the childs range of activities. When the child leaves the defined area, the mobile phone parents mobile phone will receive an alert quickly. Prevent loss, prevent entering dangerous areas, avoid getting lost 7. High perforAdultce battery, longer standby time Use customized polymer The battery has faster charging speed and higher perforAdultce, The time is longer than the same power, eliminating the daily labor burden. 8. Fun games: Let Adult get happiness from games and grow in happiness. Why cant the sim card be recognized? 1. Check if your card is correct 2. Please check whether your sim card belongs to this gsm: 850/900/1800/1900mhz (this watch can support 2g sim card, please prepare 2g sim card) 3. Check if there is dirt on the card slot. how to use: 1. Scan the QR code on the box, you can find the QR code on the button of the box. 2. Download the settracker application and register an account. 3. Scan or enter the device ID. Each device has only one unique id, which can only be used once, which is the entrance to connect the watch and mobile phone. 4. Support multiple languages: English (default), Spanish, Portuguese, GerAdult, Turkish, Vietnamese, Russian, French, Thai, Indonesian, Polish, Hebrew, RoAdultian. Specification: Chip: PDA8955 Battery capacity: 400mah Charging time: 2h Screen resolution: 128*128 Screen size: 1.44 Waterproof grade: life waterproof (not soaked in water) Radiation: smaller than mobile phones, international standards, no impact on huAdult body Applicable age: 3-12 years old Positioning method: base station positioning (no GPS positioning Specification: