Feature • The flush-mounted panel is made of 3mm-thick STAINLESS STEEL with 2X4 buttons. • The tailored-made SAFETY SCREW and stainless steel CALL BUTTONS, you now can stop worrying the ill-intended damage. • Multi-choice to release the door, like ID card, SERVICE BUTTON, and EXIT BUTTON, you name the way, and you get the way. • The enclosed REMOTE CONTROL enables system program as easy as A-B-C. • There is a sound reminder during calling the door station and door release, machine friendly talks. • 1/3’CCD color camera with in-built IR LED ensures clear image at night. • The modular design concept, even one module fails, others keep function to serve you. • Compatible with all audio and video indoor phones of C-5 ONE CABLE system.