Bcomtech 7" LCD Video Phone Intercom for Office Apartment With Kinds of Bell Tones Video Door Bell Unlock Monitor 2V4 Wide Angle CMOS Camera Door Phone Dual-Way Intercom IP65 Indoor Monitor,Aluminum wire drawing,7 inch LCD Display,Ring,Volume Adjustable,Built-in Memory can save 80 pictures, support max.32G SD Card(Not Included) 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. Support 4 indoor monitors,2 doorbell camera,and 2 CCTV Camera.PIR sensor is also compatible. There is two pieces 5 meter extension cable for monitor and doorbell, three pieces 5 meter extension cable for monitor and monitor in the package.