product description: The appearance of the door station is similar to the traditional optical cat's eye, and the hidden camera 3.5-inch high-definition display, 480*320 1 million professional security camera, 130 degree wide angle Power supply: 4PCS AAA dry batteries (not included in the package) Ultra-long standby Minimalist design, easy to operate, plug and play Support door thickness 40-110MM Door hole diameter: 14-28MM packing list: 1: Indoor host *1 2: Outdoor handset*1 3: Metal hanging board*1 4: Screw bag*1 5: English operation guide *1 Product packaging weight and size: Color box size：13.7*14.7*4.7cm (including color box) total weight：212g