... data voice ,image transmission3)Full-duplex hands-free call ,clear audio and video4)Visiting key wake up call ,standly power-sawing ... bulit-in antenna design ,fashionable outlook9)super-infrared night vision video monitor capability10)other optional function:auomatic inage shorge ,photo ... HeTanGang,Beizha,Humen,Dongguan,Guangdong, China check out the high tech video door phone ,rock and roll set up