Model HD Combine Tester System Specification Screen 4.0 inch TFT 800*RGB*480(WVGA) resolution, 16.7M color, backlight brightness adjustable Operation Method Power key, 12 control keys, QWERTY flip keyboard with 45 keys Auto Power Off Disable/ 5~60 minutes Keyboard Tone Enable/ Disable Upgrade Support online upgrade Power Power Input POE source or POE injector POE Injector Input AC100~230V 50~60Hz, output 48V/15w Battery Dedicate battery, user replaceable, 7.