Description: 3.5 inch color TFT LCD panel display, 320 x 240 screen resolution Can be installed on the door Uses CCD or CMOS image sensor Monitor the situation out of the door, press monitor button to turn on the display to see outside anytime. Alarming function Cable connection, wall or table mounts installation. Ring indicates the visitor"s coming. Can press monitor by 1500 times at least per 3 pcs AA battery. (NOT INCLUDED) Auto extends shut off when nobody answers Specifications: Image Sensor: 300,000 Pixel CMOS Optical lens: View Angle 60 degrees Peephole: View Angle: 170 degrees LCD Screen: 3.5 inch TFT Power Source: 3 AA Batteries (Batteries are not included) Barrel: 12 mm ~14mm Door Thickness: barrel will fit doors that are 35~65 mm wide Size: 155mm x 105mm x 30mm Weight: 420g Package Included: 1 x Peephole viewer (language: English and Chinese) 1 x Peephole Len 1 x instruction book 1 x Peephole Barrel