RadioShack FM Wireless 3 Channel Intercom System, Set of 3, 43-3105

This 3-station wireless intercom allows you to communicate throughout your home/office without yelling or trudging upstairs or into another room. It is designed especially for homes and offices fitted with 3-wire AC outlets. Its 3-channel operation allows private conversation between any two channels without disturbing the other, and it's expandable, so you can add additional stations if/when you need them. Lockable talk button allows you to monitor another room with confidence FM circuitry provides clear, reliable reception and transmission Call button signals other stations.