Navigation performance GPS module: SIRF III 20 channels Position percision: within 10m, 90% typical Map: N/A Main parameter Processors: SAMSUNG2440 400MHZ (ARM9) O/S: Microsoft Widows 5.0 Screen: 3.5 inch, 65K touch TFT screen Resolution: 320x240pixels Extend parameter Storage: 64MB SDRAM, 32MB Flash ROM Extend Jack: SD/MMC slot, USB1.1 Appearance Antenna: Built in Product weight: Product size: Basic parameter Battery: 1300mA rechargeable battery Other function: built in speaker, stereo headphone output Audio format: WMA9, MP3, WAV Video format: WMV, asf, avi Accessories: Brace, Power adapter, Car recharger, Pen, USB cable, Headphone, User manual