Accessory handset is designed for use with AT&T Dect 6.0 TL86109 Telephone System with Bluetooth capability. Dect 6.0 technology delivers up to 45 percent more range over 2.4 GHz and 5.8 GHz phone systems without needing a boost in power. Handset offers an equalizer for customized audio, high-contrast backlit LCD and lighted keypad, speakerphone, Caller ID/Call Waiting with a 50 name/number history, volume control, last 20-number redial, and ringer volume control. AC-powered handset includes a charging cradle, belt clip, power adapter and NiMH battery. Handset is headset compatible with its 2.5mm jack. Setup menu is in English, Spanish and French. Energy Star qualified.