Patent ID: 7120388

Claim:
An intercom system enabling a plurality of users to listen to and at least one user to speak to and listen to a remote user, comprising: a base station for communicating with said remote user; and a plurality of ear pieces wearable by said plurality of users, each of said plurality of ear pieces being capable of wirelessly communicating with said base station; at least one of said plurality of ear pieces being capable of speaking to said base station within a first range of said base station; each of said plurality of ear pieces being capable of wirelessly listening to said base station within a second range of said base station; said second range being larger than said first range; whereby one of said plurality of users wearing said at least one of said plurality of ear pieces may listen and talk with said remote user only within said first range of said base station and a remainder of said plurality of users wearing a remainder of said plurality of ear pieces may only listen to said remote user outside of said first range of said base station but inside of said second range of said base station.