1. The product is installed in the position of the peephole on the door, replacing the optical peephole door mirror, and clearly displays the outside the door on the screen of the inside the door, allowing the to see the visitors outside the door , and manually take pictures. 2. The outdoor machine replaces the optical eye, 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 camera, the appearance is similar to the 's eye (CMOS 1 pixels, maximum support 1280*720P, display/record outdoor images) 5. The in-door machine uses a 4.3-inch TFT LCD display with a screen resolution of 480*272. 6. The 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 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 regularly, and the latest photos will be automatically saved. Parameter: length: 2.4mm Horizontal viewing angle: 140 degrees Number of : F2.0 Automatic shutdown: 15 seconds Power-off memory: support Standby current: 100UA Working temperature and humidity: -30Celsius-65Celsius(outdoor)/ -10Celsius-50Celsius(indoor) humidity is less than 90% Installation : screw hanging plate Battery: 3.7V 1800MA lithium battery, 1 standard Colour:black Material:Zinc alloy Package Contents: 1 * indoor observer 1 * peephole camera 1 * hanging board 6 * screws 1 * English 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.