The Wireless Home Intercom System from Hammacher is a digital, four-channel home intercom system that allows you to talk room to room. The device uses a wireless 900MHz digital spread spectrum signal to transmit clear, uninterrupted sound to every room, up to 1,000 feet range. The Wireless Home Intercom System features the voice activation mode that allows you to monitor a room and you can conduct conferences using more than two units. The gadget requires four AA batteries that provide enough juice for up to a year of operation. Hammacher sells the Wireless Home Intercom System for $119.95.