... comfortable one-handed operation in the field. It runs on Windows CE, a robust, real-time operating system. The ... including 4 action keys, 12 alphanumeric keys, tab key, function key, backlight key, power key,and 4 cursor-control (arrow) keys;membrane ... adapter)SD Card Reader (required for some upgrades)Windows XP (SP2 or SP3) or Windows Vista Business (SP1) POWER SUPPLY / CHARGER BatteryRechargeable ...