Bcomtech Doorbell Intercom 7 inch Video Door Phone Intercom system Camera Recorder Dual Way Talk 1200TVL 1V1 Metal Case Waterproof IP65 Slim Design Indoor Monitor 7" LCD Large Screen,Acrylic and Aluminum wire drawing shell,polyphonic melodies, ring volume, talking volume, chroma and brightness adjustable,Built-in Memory can save 80 pictures, support max.32G SD Card(Not Included) Rainproof, anti-oxidation, durable metal outdoor camera HD 1200TVL IR Camera with Night Vision function, Pinholecapture images in low-illumination environment with 90 degree wide viewing angle,Surface Mount Video and Audio Chat, Dual-way intercom,Adjust Lock Time,Compatible with all electronic lock.3 mode sound volumn(Rest/work/jollification mode), There is a flexible option of setting the volume from mute and up to 10, making it convenient for night time. Designed to be easy to expand. Connect up to 4 indoor video units with 2 outdoor video doorbell and 2 CCTV cameras kits to expand your coverage of entry points. It also could compatible with alarm There is one piece 5 meter extension cable for monitor and doorbell in the package.