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There are two main types of Outdoor or Front Door ( doorbell ) and Gate Intercom Systems. These are, of course, wired and wireless systems. The most popular form of wired system is the video door phone or monitor. These video doorbells not only have communication capabilities, but one way video monitoring and automatic door unlock. The Door intercom station is always weatherproof, and additional monitors can be added to the system. These systems are usually a simple 2 or 4 wire system, depending on whether the door unlock feature is used. If not, they can often be used wit additional doorbell wiring.
For outdoor, gate and front door communication, wireless intercom systems are quite popular, mostly because of the ease of installation. The best for outdoor use are the intercom that work as cordless phones, this appeased to the line carriers that actually send the FM signal through AC wiring. These front door intercom systems are expandable by up to as much as 5 personally addressable indoor stations, or additional doorbell or outdoor stations. Front Door and Gate access wireless intercom systems, along with the gate access switch, often have a telephone interface that will let you know someone is at the gate, as well as which outdoor station is trying to beckon you.
Purchase at the G.I.N. Electronics Custom Install Store