Function & Features:    
1. Back-light compensation technology  achieves HD clear and    vivid pictures. 
2. Visible inultral low light illumination, Still Good image    enven if camera face the sun 
3. 120 recycled images of interal memory, just press the key to   take a photo or video   
4. Time and date marks on the photos for later watching,    increas home security 
5. Very Easy DIY installation 
6. Power saving design,4 AA batteries(good for more than 2000peeps). 
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