1.No need connect with the internet, no need any charge 2.No need installation, paste to the front windshield by cupule. Don't influence the car inner structure and circuit 3.Touch screen operation 4.Support SD/MMC card, read and use the data reliably, easy to expand the data. 5. 3.5 inch TFT 65535 color display 6.Built-in rechargeable 1200mAh/3.7V lithium battery, 4 hours playback time without exterior power 7.Built-in 1W@8ohm speaker 8.Select best route automatically, voice navigation. Freely switch between three-dimensional and over-look view 9.Built-in flat GPS antenna, and with the MCX outer antenna port 10The Sensitivity of GPS receiver module is up to 159dBm 11.GPS Startup time: Less than 42 seconds for cold boot, less 18 seconds for warm boot, less 1 second for hot boot 12.Video format: WMA, ASF, AVI 13.Audio format: WMA9, MP3, WAV 14.Photo browsing: JPG, GIF, BMP,PNG 15.Text reading: TXT