With high-resolution camera,LCD/TFT monitor.        
 Calling Function:when doobell rings,photo will appear on the monitor.
 Monitor Function,view the outdoor situation any time.
 Camera Function,take photos and with 200pcs picture storage.
 With indication function of clock/date.
  Function of night vision compensation (Recogonization of visitors at night).
 Sixteen built-in rings,adjustable volume.        
 Power supply:1 pcs lithium  battery,60-90 stand-by days.     
 Fit to 35-100mm door thickness,ole diameter dφ14-φ35mm.                                   
 Indoor unit outlet dimension:85*110*20MM.           
 Outdoor unit outlet dimension:38*80*13MM.