DESC: Operating on Frequency Hopping Spread Spectrum (FHSS) technology, Panasonic's KX-TG6051M 5.8GHz Expandable Phone/Answering System works simultaneously with your wireless network while maintaining superior clarity, range and security. It's expandable to 4 handsets, and features a digital speakerphone and intercom between the (optional) handsets, and up-to 3-way conference capability.