http://www.intercomsonline.com: A Wireless Call Box is an outdoor intercom that is used for long range communication to two way radios and base station intercoms. These callboxes are used anywhere people may need assistance.
For a good article on how to choose a wireless call box go to http://ezinearticles.com/?How-to-Choose-a-Wireless-Call-Box-System&id=1102003
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