When you need a wireless intercom system that is battery operated, there is really only one choice, the WireFree Wireless Intercom System. The WireFree system uses four AA batteries system has a battery life of over a year. It is also the only system that is a complete system that includes a portable, indoor and outdoor intercoms.
The best part of a battery powered system is that all units are portable. You can wall mount these units, but if you set them on a table top, you can move them anywhere you want!
Click on the Wireless Intercom link on www.intercomsonline.com for more information.