Feature:1. With plastic and zinc alloy door viewer head, anti‑theft, anti‑prying and anti‑peep to make you feel more secure.2. 2IR LED infrared night can monitor the situation outside the door during the day and night, take pictures and video.3. There is equipped with active CMOS digital image sensor, automatically enter standby mode to save electricity.4. When the voltage is low, the power icon will flash and make a beeping sound to remind you.5. Support Memory card(NOT included), support up to 32G. Insert memory card to record and store the situation outside the door.Specification:Item Type: Digital Door ViewerMaterial: Plastic and Zinc AlloyZoom: 3X Digital ZoomCamera: 720P, 125°Display: 3in HDNight Vision: 2IR LEDBattery: 1000mAh Lithium Battery(Built-in) Power SupplyIntelligent Adaptation System: Selectable Mode and RingtonesSupport Door Hole: Approx. 14-35mm/0.6-1.4inSupport Door Thickness: Approx. 35-110mm/1.4-4.3inEnergy Saving: Automatic StandbyFunction: Photo, VideoHow to Use: Press the power button and the display will light up. When the visitor presses the doorbell, the indoor host device will emit ding-dong sounds, and the LCD screen will automatically turn on, and indoor users can see who is outside the door. Package List:1 x Outside Door Viewer1 x Inside Display 1 x USB Charging Cable1 x Metal Hanging Board1 x Screw Pack1 x Manual