Network Support: GSM900/1800 MHz, WCDMA2100+simulation intercom 400MHz Conventional intercom: 400-520MHz Dominant Frequency: 1.2 Ghz Platform: MTK 6572A Operating System: Android 4.4.2 Memory:32Gb+4Gb Extended Memory: up to 32Gb Battery Capacity:3500mAh Screen TP Display:2.4QVGA 240*32 multi-point touch screen Intercom Globally Cameras in the front and the back, focus automatically Super-strong standby more than 800 hours 32-diameter speaker with double chambers Positioning system supports GPS+BeiDou Support WIFI/ BT/ MP3/MP4 MICRO 5PIN data line Reporting number command of English and Chinese IP54 protective design, military quality