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 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 ) hot start-2s (open ) the specific time 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 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.