Omni-antenna, very precise global positioning; Support of RFID R/W capability and wireless data transmission Size: 147.5(L)mm*66(W)mm*31.5(H)mmBattery: rechargeable polymer battery(3.7V,3200mAH)Touch panel: OLED 2.8-inch QVGA transmissive colorOLED features: directly light-emitting, greater viewing angle, visable and stable image under the sun, high-brightness, rich colors, high resolution, low ...