Feature:1. 2.8in LCD Screen: 2.8 inch digital TFT LCD screen, high definition LCD display with 300000 pixel, let you see everything outside the door very clear.2. 90 Wide Angle: This digital door viewer with 90 wide angle lens provides you with a large field of view to ensure home safety.3. Security Monitoring: Security monitoring to protect you and your family around the clock. Timely and clearly photograph and record visitor information.4. Energy Saving: Don't need to charge, need not worry about the home blackouts. Energy conservation, environmental protection.5. Easy Installation: Practical smart home security doorbell, no need for perforation and wiring, easy to install.6. Widely Use: The digital door viewer is widely used in your house, apartments, villas, hotels or offices etc.Specification:Item Type: Digital Door ViewerMaterial: ABSUse: HouseholdBattery: 4 x AAA batteries (without batteries)Screen Size: 2.8inScreen Resolution: 320 x 240Camera Pixel: 300000Infrared Light: 2 x 850nmViewing Angle: 90 degreesSuitable Door Hole Diameter: Approx. 14-22mm/0.55-0.87inSuitable Door Thickness: Approx. 35-120mm/1.38-4.72inOperating Environment: -20 - 55.Package List:1 x Inside Machine1 x Outside Door Viewer1 x Fixed Plate3 x Screw1 x Instructions