. 3.5 inch TFT touch screen, resolution: 320*240. Super slim model. 2. CPU: Centrality Atlas II (AT440) 3. Built-in 64MB SDROM 4. Operating system: WinCE 5.0 5. Storage: internal 64M Nand flash / external SD card 6. Types of operation methods: touch screen 7. Functions: Navigation, MP3, MP4, JPG picture, textbook, calendar 8. Numbers of signal receiver: 16 Channels 9. Precision of Locating:Less than 10m 10. Antenna: with GPS internal Antenna and reserved external GPS Antenna jack 11. Battery: with 1100mAH built-in Lithium battery, can continuously use for about 5 hours 12. DC IN: 5V 13. SAMSUNG 2440 400MHz + Si-RF III 14. with outside speaker