1.Windows CE 5.0 2.3.2''TFT touch screen 3.RS232, Ethernet, and USB HOST /Client 1.1 4.GPRS, WiFi ( ... 1%Temperature0°C-50°CHumidity20%-80%Audio formatMp3,WAV, VideoCommunicationRS232, Ethernet, and USB HOST /Client 1.1Battery4000 mAh Lithium-ion ... / DC5V 2A,Continuous time of batteryContinuous Working 4 hours Standby 3 daysOptional functionGPRS, WiFi (Optional)Extendable devicesID card, Mifare card, ...