1, the volume is ultra-small, the GPS is positioned within 5 meters, and can be positioned globally. 2, the call is clear, remote control. Remote recording. 3, computer, baby sight mobile application and convenient. 4, set up an administrative account, the management of multiple devices is more convenient. Specification: Chip: MT2503 / MTK3333 / MTK5931 Memory: 32M Flash memory RF power amplifier: RDA6625E Working environment temperature: -20 ° C - + 70 ° C Working environment humidity: 20% -80% RH SIM card: Nano SIM card holder GSM band: 850MHz / 900MHz / 1800 MHz / 1900MHz GPRS: Class 12 Battery: 5V 3.7V 400mAh charge Average standby current is less than 2ma (determined by connection method) I / O interface: Built-in mini 5pin Speaker: 0916 AAC specification MIC: high definition silicon wheat (sound can be heard within 10 meters) Sensor: 3D g-sensor TF: Support 32G long recording GPS positioning degree: within 10 meters WIFI positioning degree: within 50 meters GSM positioning degree: 50-200 meters (depending on network conditions) Speed: 0.1 m / sec GPS positioning time: cold start-38s (open sky) hot start-2s (open sky) the specific time will be affected by the environment Shell: PC GSM antenna: PIFA antenna Standby time: determined by battery capacity and connection method Operating voltage: 3.5-4.2V (3.4V low power automatic shutdown) Charging current: 5V 800mAh charge (current can be set according to battery capacity) Colour: silver Material: plastic + metal Size: 35x2x4.5mm Package Contents: 3 x GPS Tracker Note: insertion style and ejection style randoms, Not accepting designation