1、Clear Display: 3in LED display with a resolution of 240x320, the picture is clearly displayed, and the situation outside the door can be clearly seen. 2、Adjustable Ringtones: Doorbell function, 4 kinds of ringtones to choose from. 135° wide angle camera, wider field of view. 3、Infrared Detection Sensor: When the light is insufficient, it will automatically switch the night vision function, and it is clear at night. 4、Durable Construction: Aluminium alloy camera housing, impact resistant, prevent from being damaged, suitable for doors with a thickness of 35‑120mm. 5、Wide Application: Suitable for families, apartments, office buildings, hotels, etc., iron doors, wooden doors, security doors, glass wooden doors, etc. Item Type: Digital Door Viewer Material: Aluminum alloy, ABS LED Display Size: 3in Resolution: 240 x 320 Sensor: 0.3MP CMOS Active Digital Image Sensor Doorbell: Doorbell function, 4 kinds of ringtones to choose from Memory Card Slot: Support up to 32GB Night Vision: 2 infrared LED lights with night vision function, the LED will automatically turn on under the backlight Battery Type: 4 x AAA (not included) Applicable Door Hole Diameter: Approx. 14-55mm/0.55-2.17inApplicable Door Thickness: Approx. 35-110mm/1.38-4.33in Uses: Suitable for various places and doors, such as homes, apartments, office buildings, hotels, etc., iron doors, wooden doors, security doors, glass wooden doors, etc. 1 x Camera 1 x Monitor 6 x Screw 1 x Manual