SECO-LARM DP-236Q Wireless Video Door Phone System, Wide 3-3/8" Monitor Screen for Enhanced Viewing, Adjustable Lens for a Wide Variety of Viewing Angles, Camera's Built-in PIR Sensor Talk with visitors and unlock doors or gates via the monitor Handheld monitor's rechargeable battery allows convenient communication with visitors while moving around the premises Egress input allows the door phone to be connected with a Request-to-Exit Plate or other egress device Camera's built-in PIR sensor takes photos of approaching visitors Tamper switch triggers alarm if camera is removed from its base