... Battery: Rechargeable li-ion polymer battery (3.7 V/4,000 mAh) Expansion slots: SIM/SAM/Micro SD (TF) card, Indicator ... six sides (concrete floor, under operating temp) Rolling survive: 1,000 times, 0.5 meter, rolling by six contact surfaces Operating ... pixels, 2048 (H)*1536 (V), QXGA6. All alphanumeric keypadStandard Accessories4,000 mAh Li-ion battery, Usb cable, RS232 serial cable, Touch ...