The Comelit Hands-Free Video Intercom System brings innovative technology direct to your home or business. This video intercom is not only convenient to use, but more importantly, provides an additional measure of security for your family. For residential or commercial properties where access control is a concern, the system safeguards your entrance while remaining user-friendly. Comelit intercoms offer peace of mind because users can safely identify visitors before answering the door. Simply by ringing the doorbell, the system transmits live audio and video directly to the monitor. Kit Includes: Color Hands Free Master Station Surface Wall  Mount Door Station Power Supply Features: Expandable up to 4 monitors and 2 door bell cameras Simple 2 wire installation (CAT5 to 18AWG) 3.5 inch LCD color monitor Monitor to monitor intercom communication 1/3 inch CCD chipset Camera angle adjustable horizontally White LED illuminator Weather resistant plastic door bell housing Remote door release (12VDC or N.O. contact) ** Lock not included Adjustable speaker, mic and chime volume.