... frequency: 20Hz-20 KHz - Batteries: built in Rechargeable Li-ion battery - Interface: USB 2.0 - Operating system: windows 98/2000/XP/ ... screen, Keyboard, Wifi, WLAN, Camera, all Card Slot and USB Slot, G-Sensor, Bluetooth, Microphone, SpeakerWe shall test if there ... GPS (excluded 3G function at this moment)Accessory Test: Battery, USB Cable, Earphone, Charger, TF card Warranty:All electronic products ...