1)wifi,bluetooth,gprs, voice communication 2)optional camera,rfid,1D scaner,infrared,gps 4)IP54 ... QVGA color; resistive touch screen ,backlight3.2'',resolution 240*320 dpi Operating Keys24 +2 custom keysenclosed stylus or fingertipCommunicationWLAN USB ... Mobile SDKProgramming EnvironmentMicrosoft® Visual Studio® 2005 support NET CF 2.0Microsoft® Visual Studio® 2008 support NET CF3.5Develop language: ...