Features: 1. the volume is ultra-small, GPS is positioned within 10 meters, and can be positioned globally. 2. the call is clear, remote control. 3. computer, mobile APP view baby and convenient. 4. set up an administrative account, managing multiple devices is more convenient. Specification: Chip: MT2503/MTK3333/MTK5931 Memory: 32M Flash Memory RF Power Amplifier: RDA6625E Motherboard stack size: 20*35*4.5mm (thickness is the total thickness of PCBA+GPS antenna) Working environment temperature: -20 C - +70 C Working environment humidity: 20%-80% RH SIM card: for Nano SIM card holder GSM band: 850MHz/900MHz/1800 MHz/1900MHz GPRS: Class 12 Battery: Charging 5V 3.7V 800mAh Standby average current is less than 2ma (determined by connection method) I/O interface: built-in Micro 5pin Speaker: 0916 specification AAC 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 Speed: 0.1 for m / sec GPS positioning time: cold start -38s (Open for sky) hot start -2s (Open for sky) specific for time will be affected by the environment Shell: PC GSM antenna: PIFA antenna Standby time: determined by battery capacity and connection method Working voltage: 3.5-4.2V (3.4V low power automatic shutdown) Charging current: charging 5V 800mAh (current can be set according to different battery capacity) Quantity:1Pc Note:1.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes:(No Retail Packages) 1 x GPS Tracker