Expandable, digital cordless answering system includes a base, four handsets and DECT 6.0 Plus Technology for superb sound quality and outstanding range. By increasing the frequency of error correction by up to 80X, the transmission quality is improved, and the phone's range is extended. Engineered to work in 1.9GHz frequency, the DECT 6.0 phone won't conflict with common wireless devices and delivers long-range and clear sound while deterring eavesdropping. Powerful battery backup system keeps you connected when the power goes out. Phone also features up to four-way conference capability, Talking Caller ID with announcements between rings, Ringer ID, Call Block, Silent Mode, Intelligent Eco Mode, Range Boost technology to extend range, tone equalizer to maximize clarity, and reversible handset design. Both base and handsets have hands-free speakerphones. Handset features a white backlit 1.8 LCD and a nonslip design. Base is wall-mountable and is expandable up to six handsets."