Aiphone - KC1SD - KC audio-only sub master handset (max 2 per system) ( 11122 ) Up to three inside stations (KC-1GRD main room station and up to two KC-1HRD sub room stations). Clear, crisp color image with 4" TFT display and One video door station. Tilt control for camera adjustment and All Call and 2-way internal communication via handset. Hands free Audio and Video monitoring when door calls or when Monitor button is pressed. Video images from the door can be recorded using the KC-32EU