Megapixel: With a professional security camera, you can details better, giving you a great experience.120 Wide-angle Lens: Equipped with a 120 wide-angle lens, clear into the details outside the door to reduce safety hazards.Fashionable design: Fashionable and classic design, simple features, it is suitable for European and American aesthetics.Invisible camera: Using invisible camera with a similar appearance to the peephole,with one-click viewing without storage to privacy. alloy outdoor sub-machine: alloy material is -proof, it can prevent human damage to the maximum extent.Type: Peephole DoorbellSensor: 2 CMOS SensorScreen Size: 3.5-inch LCD ScreenFunction: Energy Saving, Low Alert Supply: 4 x AAA Batteries (Not Included).Outdoor Parts Size: Diameter 31mmDoor Hole Range: 14-28mmDoor Thickness Range: 35-110mmNote:1. Please confirm the of the AAA battery before , it is best to 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 as needed 3. First install the battery, then the lines, and finally the test and it.Colour:blackMaterial: alloySize:120x62x20mmPackage Contents:1 x Indoor 1 x Outdoor 's eye 1 x Metal hanging board1 set x screwsOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.