Product DescriptionFeatures: Electronic peephole viewer is a new type household security product. It is different from the traditional electronic peephole viewer. It is equipped with LCD screen as the indoor window for observing visitors. More beautiful and safety. This product can not only be replaced in the existing electronic peephole viewer, but also simply installed on the new door. It can totally replace the traditional electronic peephole viewer Parameters: LCD screen size: 2.8 inch Power: 3 AAA batteries (Not included) Camera pixel: 300K pixel Fit for Door Thickness: 1.38 to 4.13inch The installation hole size: Φ0.7inch Operating temperature range: -25centigrade - +55centigrade Package contents: 1 x Indoor 2.8" LCD monitor 1 x Outdoor camera 1 x Set of Accessories 1 x User manual