• LED Light & illumination sensor Built in : Offers Clear Images During Night Time
• Microphone: For Communication With Visitors
• Camera lens: Providing Images
• Call button: To Call a Residence
• Speaker: It Delivers Voice and Sound to  and From a Visitor.
• Screw Holes For Mounting
• Door Release Connection Terminal
• Monitor Connection Terminal
• Wall Bracket.
• Outdoor and indoor use (not waterproof)
• Volume Controller
• Angle Adjustment on Camera 

Specifiction

• 4 wire system (polar) to video doorphone,  2 wire system (non-polar) to electric door strike
• 1/3" Solid CCD
• Simultaneous Communication
• CMOS image sensor
• Communication: voice switching
• NTSC standard
• Weight: 640g
• Dimension: 116mm Wide X 169mm High X 42.5mm Deep