Specifications: Image Sensor: 300,000 Pixel CMOS Optical lens View Angle: 60 degrees Peephole View Angle: 150 degrees LCD Screen: 3.5inch TFT Power Source: 3 AA Batteries (good for approx.1500 peeps) Batteries are not included Peephole barrel(diameter): 12 mm -30mm Door Thickness barrel will fit doors that are 42-70 mm wide Accessories: Base flange, Tightening tool, Peephole, User manual Size: 155mm x 105mm x 30mm Total Weight: 1.1kg Package include: 1 x Peephole viewer 1 x Base Flange 1 x Peephole lense 1 x 11cm wire 1 x Peephole Barrel Easy DIY without construction: Five minute fast assemblage of parts of the digital door viewer by yourself. Multiple chord melodies: melody volume is adjustable. Super power saving: press monitor button by 1500pcs at least per 3pcs AA batteries (Batteries are not included in the kit). Trademark AGPtek products are marketed exclusively by Brainydeal