Wsdcam 3.5 inch Camera Peephole Doorbell 120 Degree Door viewer Wirele Doorbell Smart Home Door Camera with Monitor Mirilla Description: Type: Peephole Doorbell Color: Silver + Black Sensor: 2 Mega CMOS Sensor Screen Size: 3.5-inch LCD Screen Function: Energy Saving, Low Power Alert Power Supply: 4 x AAA Batteries (Not Included). Indoor Parts Size: About 118 * 63 * 18mm Outdoor Parts Size: About 32 * 32 * 8mm Packing Size: About 150 * 140 * 45mm Door Hole Range: 14-28mm Door Thickne Range: 35-100mm Package Weight: 192g Note: 1. Please confirm the power of the AAA battery before use, it is best to use a new battery. Please confirm the positive and negative poles of the battery during installation. 2.This doorbell is simply peephole doorbell. You cannot link your mobile phone and WiFi. The outdoor machine does not have a button. Please choose as needed 3. First install the battery, then connect the lines, and finally start the test and use it. 4.This product doesn't support night vision. Please allow 1-3 CM differs due to manual measurement. Thanks for your understanding. Packing list: 1 * Indoor host1 * Outdoor cat's eye camera3 * screw (L/M/S)1 * Metal hanging board1 * User Manual Megapixel: With a profeional security camera, you can restore picture details better, giving you a great visual experience. Invisible camera: Using invisible camera with a similar appearance to the traditional peepholewith one-click viewing without storage to protect privacy. Zinc alloy outdoor sub-machine: Zinc alloy material is vandal-proof, it can prevent human damage to the maximum extent.