"AT&T CL80100, The AT&T CL80100 DECT 6.0, expansion handset is for use with AT&T CL81000, CL82000 and CL84000 series phone systems
Offering you superior call quality and range, this sleek handset is a great addition to your existing phone system. The 50 name/number caller ID history ensures that you never miss an important call and equalizer that lets you choose from 4 preset audio profiles for customized audio. Additional features include call transfer, 5 number redial, and trilingual menu support. CL80100 Features: New DECT 6.0 Technology - Interference Free Communication - Increased Clarity / Enhanced Security - Wider Range / Network Friendly, 1.9GHz Extra Handset / Charger - Dedicated for Cordless Phones by the FCC - 30 Battery Life Increase Over 5.8GHz, Caller ID / Call Waiting, Eco-Friendly Phone, Hearing Aid Compatible, Handset Speakerphone, Large Backlit LCD Display, Lighted Keypad, Dial Display, 50 Station Name / Number Caller ID Memory, 50 Station Phone Directory / Dialer, New Call Indicator, Missed Call Indicator, Selectable Ringtones, Handset Volume Control, 20 Station Redial, Any Key Answer, Trilingual Menu Support (English / Spanish / French), Will Not Work Without Base: CL81100, CL81200, CL81300, CL82100 CL82200, CL82250, CL82300, CL82350 CL82400, CL82450, CL82500, CL82550 CL82600, CL84100, CL84200, CL84250 CL84300, CL84350"