... -speed mobile video transmission systemUHF wireless digital transmitter. receiver .connector (Optional Accessories)UHF wireless digital transmission equipment, can link 3G ... , while placed on the vehicle, for mobile transmission, audio, video,and GPS data can be separate connect to ... : 8M SD , HDD optionRecord mode: Manual , alarm ,timed Audio intercom : One channel BNC Two-way intercom, aideo code G ...