Operating system: WinCE 6.0 Functions: Navigation, MP3, MP4, JPG picture,E-Book Built-in 64MB SDROM Support ... / external memory6. Types of operation methods: touch screen7. Functions: Navigation, MP3, MP4, JPG picture,E-Book8. Numbers of signal receiver: 20 ... ,Support Rear-view Backup Camera function14.support different map:Route66, I-GO, Ndrive,ect15. support 19 languages 16. with outside speaker ...