... -in 3G dongle (optional)Highlight and high sensitivity of capacitive touch panel 16:9 realize perfect movie full screen play, 1080P HD ... swithch on/off, Circuit control switch on/off6. Support centralized network update advertising, we have supporting server client This is a ... , each taxi can update the AD resources by 3G ,even wifi , SD card or LAN, glad to have more your idea ...