Usage:Personal Color:blue red black Size:40.5*43.3*13.8mm Network:GSM GPR 1900MHz Net Weight:25g GPS Positioning accuracy:10-15m(under the open sky) Wifi Positioning accuracy:15-100m Battery:Built-in,400mAh GPRS standard:Class 12, TCP IP Working humidity:5% ~ 95% RH Certificate:CE Rosh