Function & Features:  
1. Back-light compensation technology can achieve HD clear and    vivid pictures. 
2. Visible under ultra low light illumination 
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; Install vertically when the door panel space is not enough
6. Low Power Consumption,4 AAA batteries(good for more          than 2600peeps,about 2  years). 
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 AAA 1.5V Batteries  
7. Color optional:  Silver, Gold,Champagne or customization 
8. Accessories: Digital Peephole Viewer, Base flange, Tighten Tool, User Manual, 4pcs x AAA Batteries (optional)
9. Size: 128*72* 16.8mm  
10. Weight:  180g