... Expansion Memory:4G TF (standard), maximum 32GInterfaces: USB 2.0, RS232Physical characteristicsScreen: 3.2" QVGA backlight TFT-LCD, 65 K colors ... under operating temp) Rolling survive: 1,000 times, 0.5 meter, rolling by six contact surfaces Operating systemWindows ... QXGA6. All alphanumeric keypadStandard Accessories4,000 mAh Li-ion battery, Usb cable, RS232 serial cable, Touch stylus, 4G microSD ( ...