1. The product is installed in the position of the peephole on the door, replacing the optical peephole door mirror, and clearly displays the image outside the door on the screen of the host inside the door, allowing the owner to see the visitors outside the door , and manually take pictures. 2. The outdoor machine replaces the traditional optical , does not need to look closely, has a visual range, is not restricted by height, and can be suitable for the elderly and children. 3. Zinc alloy material outside the door (anti-theft, anti-pry, anti-peeping). 4. The outdoor unit has a built-in hidden camera, the appearance is similar to the traditional 's eye (CMOS 1 million pixels, maximum support 1280x720P, display or record outdoor images) 5. The in-door machine uses a 4.3-inch TFT LCD display with a screen resolution of 480x272. 6. The host adopts single button operation, simple operation and practical function. 7. The machine supports TF card, maximum support 32G. a) Photographs are not supported when the card is not inserted. It can be used in hotels to better protect the privacy of visitors. b) Insert a memory card, you can manually take pictures, apply in the family, record storage query. 8. Automatic cycle coverage, intelligent identification. When the storage in the TF card is full, the new photos will automatically overwrite the oldest photos in chronological order. There is no need to delete them regularly, and the latest photos will be automatically saved. Parameter: length: 2.4mm Horizontal viewing angle: 140 degrees Number of aperture: F2.0 Automatic shutdown: 15 seconds Power-off memory: support Standby current: 100UA Working temperature and humidity: -30Celsius-65Celsius(outdoor) or -10Celsius-50Celsius(indoor) humidity is less than 90 percent Installation : screw hanging plate Battery: 3.7V 1800MA lithium battery, 1 standard Colour:black Material:Zinc alloy Package Contents: 1 x indoor observer 1 x peephole camera 1 x hanging board 6 x screws 1 x English user manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.