BW Mini 3.6mm Lens Surveillance Camera CCTV Hole Home Security Color Wired Door Eye Viewer with Free UK Power - this product is the hole camera for the door. - It is available for any thick door and easy to install. - Fix the hole camera on the door hole directly. Connect the camera AV cable with the monitor - Connect the camera power plug with the adapter Visitor Identifying, Moving Detection - Lower Power Consumption, High Sensitivity Effective Aperture: Length 26~45mm adjustable Source ASIN: B00F4SA4S6