A remote alarm door chime or a door chime intercom can really be a practical addition to any home if you want control over who comes into your house. With a remote door chime intercom you can talk to the people at the other side before you let them through the gates, or into the home for instance. There are a wide range of door alarm intercoms to choose between by brands such as Leviton, M & S Systems, NuTone, SVAT Electronics and Westinghouse among others. 
Westinghouse 4 Channel Intercom System
"Streamline communication with Westinghouse's sophisticated 4 Channel FM Wireless Intercoms. Ideal for homes, apartments, offices, stores, and small businesses. Talk to or monitor any number of rooms or offices with 4 available channels. No installation or batteries required. Plug into any AC outlet and talk. Press CALL to page another room. Press TALK to converse a complete in-home intercom system." available at homedepot.com Some of these units even come with video screens which allow you to see the other person, which can really be a nice feature. These models feature different amount of channels; some feature 2, others 3 and others 4. You can find voice activated door chimes as well as systems for the whole house, so it really shouldn't be a problem to find something that suits your particular needs. Home improvement stores such as Home Depot, Lowes and Sears are great stores to check out for a wide selection of different options.
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