1、Smart Doorbell System: 4.5in high definition large screen, clearly showing details, more intuitive observation of the state outside the door. 6 kinds of ringtones to choose from, showing your uniqueness. 2、PIR Motion Detection: When a visitor wanders at the door, the smart doorbell will start to take pictures or videos to record the visitor information and will not miss the arrival of any visitor any more. 3、Infrared Night Vision: The doorbell camera comes with 4 infrared night vision lights, and designed with 170° wide angle field of view, clearly see visitors even in dark nights, eliminates all potential safety hazards. 4、Multi Mode Design: Such as at home mode, do not disturb mode, and away home mode to choose from, meeting your various using demands. 5、High Quality Material: The peephole viewer is made of high uality zinc alloy material, which is highly impact resistant, anti smashing and anti prying, preventing violent damage and making it more secure to use. Item Type: Video Doorbell System Material: ABS, Zinc Alloy Screen Size: 4.5in Pixel: 2MP Viewing Angle: 170° Motion Detection: Supported Infrared Night Vision Lights: 4 Applicable Door Hole Range: Approx. 15-50mm/0.6-2.0in Applicable Door Thickness Range: Approx. 30-110mm/1.2-4.3in Battery Type: Built in 1PC 1800mAh lithium battery Battery Model: BP-4L 1 x Doorbell 1 x Screen 1 x USB Cable 1 x Mounting Plate 6 x Screw 1 x Manual