Uses Frequency-Hopping Spread Spectrum technology to ensure great sound, incredible clarity, long range and excellent security from eavesdropping. This phone system is equipped with an all-digital answering system for quick, easy retrieval of crystal-clear messages. Message operation has never been easier -- enjoy up to 15 minutes of recording time. Messages are stored in flash memory so they``re unaffected by power failure or interruptions. Features a light-up ringer and message alert. You only need one phone jack to operate all three headsets. Frequency: N\A; Answering System: Digital; Lines: 1; Telephone Type: Cordless.