7 inch TFT touch screen, solution: 480*234 Functions: Navigation, MP3, MP4, JPG picture, textbook Tools: calculator, calendar, alarm clock, etc. Numbers of signal receiver: 20 Channels Precision of Locating:Less than 10m Storage: internal 64M Nand flash or SD card Keystroke:5-direction Key Antenna: with GPS internal Antenna and reserved external GPS Antenna jack Can with different country's map CPU: SAMSUNG S3C2440A-40 400MHZ Battery: with 1200mAH rechargable Li battery, can continue use for about 5 hours With outside speaker Operating system: WinCE 4.2 GPRS :class 10 GPRS 900/1800/1900M DV IN: 9-28V