5.8 GHz 4-Line Expandable Cordless Handset is designed for use with Panasonic four-line, 5.8 GHZ multihandset telephone system with CID. Call Waiting Caller ID has a 50-number Caller ID Memory/Dialer. Other features include three-line LCD, lighted handset keypad, hearing aid compatibility, Frequency Hopping Digital Spread Spectrum, Navigator Key, voice scramble, ringer volume control, hold/soft key/mute, flash/redial buttons, talk volume control, speakerphone/speaker volume, intercom, join in/privacy/barge in, low-battery indicator, out-of-range indicator and up to three selectable ringtones. Handset has four lines and answering system that is compatible with base unit. Handset is mountable to a wall and includes a charging cradle.