Function & Features:
1. Back-light compensation technology can achieve HD clear and  vivid pictures. Still clear image even it face the sun light

2. Visible under ultra low light illumination.Still clear image  even if the light is not good 
3. Quick Response: Images appear in less one Second after press  the key 
4. Very easy operation, just one press on the main key lightly 
5. Very Easy DIY installation 
6. Low Power Consumption,4 AA batteries(good for more  than 2600peeps).
Specifications: 
1. Door Thickness:  40 -72mm , or 72 -110mm
2. Barrel Diameter:  14 -22mm 
3. Full Color LCD Screen:  3.5" TFT
4. Sensor:   1.3M  HD Camera 
5. View Angle:  120° (H) / 165° (D) 
6. Power Source:  4pcs x AA 1.5V Batteries
7. Color optional:  Silver, Gold,  Champagne  or    customization.
8. Accessories: Digital Peephole Viewer, Base flange, Tighten Tool, User Manual, 4pcs x AA Batteries (optional) 
9. Size: 135*86* 23.9mm
10. Weight:  230g