... Fuction: video calling & conversation, door gate monitoring, handsfree operation; ~ Systems matching: can be 1 to 1; 1 to 2; 2 ... Aluminum case; Flat screen touch, Video calling, talking conversation & intercom w/ inside extension door phones, guard centers, Door releasing, ... panorama view, and monitorization, auto night IR grasp, Keyless entry, 10.4inch TFT touch screen, 8cord ringer tone Parameter ...