Wireless Door Intercom Systems

A typical two-way wireless door intercom is made up of a door station unit and a master unit. The door station unit contains a doorbell button, a microphone and a speaker. The door station unit can be mounted outside the door to the main entrance of your house or the entrance of a building. The master unit is kept in the house, conveniently placed for your use. It has a 'talk' button, a microphone and a speaker. Both these units can communicate with each other by sending radio signals. When the visitor presses the doorbell button, the door station unit transmits a signal to the master unit which alerts you of a visitor's presence. Pressing the doorbell button also activates the microphone and speaker in the door station unit. By pressing the 'talk' button on the master unit, you can converse with the visitor. This system can also be installed and used in a business establishment to manage visitors.

In a traditional intercom system, wires are installed to interconnect floors of a building or rooms a house. A wireless system is easy to install because there are no wires to cut, join or install. In fact, you can start using these systems immediately after plugging them in an electrical power source.

• Door Intercom: Wireless intercom systems offering 2 door station units and one master unit are available. They are really useful in attending visitors in establishments with 2 entrances. Some users prefer systems that offer a 1 door station unit and 2 master units. The door station unit is shared by two users, each using a master unit of his own.
• Video Wireless Intercom: Wireless door intercom systems, equipped with a video camera, are very useful in identifying a visitor. A video camera is connected to the door station unit. When a visitor presses the doorbell button, it activates the camera which starts taking images of the visitor. The door station unit sends these images to the master station, where you can view them on a screen while talking to the visitor. This system works as if it has a wireless security camera that is capable of handling conversations as well.
• Outdoor Wireless Intercom: Most of the outdoor wireless intercom devices that are on the offer have an effective range of up to 4 miles. The master unit is installed in the house or office. On a field trip, you can use a hand-held, wireless unit, so you can talk to your assistant at the office, or a person in your house to keep yourself informed.

Whenever you use a wireless intercom, radio signals are transmitted back and forth between the door and master unit. These radio signals can be captured using an electronic scanner. It is a radio device that is used to receive radio signals and can be used to eavesdrop on one's conversation. Wireless instruments that operate on the same radio frequency, as your wireless intercom can also be used for listening to your conversations. There are some intercoms that use 900 MHz radio frequency band to transmit and receive radio signals. These devices use digital technology to make listening into your conversation difficult.