Equipped with DECT 6.9 digital technology, this accessory handset with charger is designed for use with AT&T answering systems with Caller ID / Call Waiting including CLCL81201, CL82401, CL81301, CL82201, CL82301 & CL82311. High-contrast backlit LCD on the phone shows the name, number, time & date of incoming calls. Handset includes 50-name / number Caller ID history. It doubles as a multiple-handset walkie-talkie to instantly communicate with up to four units in your home. Handset speakerphone allows you to speak & listen without holding the handset. This leaves your hands free to do other things & lets more people in on the conversation. Choose from four preset audio profiles or use the equalizer to personalize bass, treble & natural tones for your individual hearing needs. Handset also includes a nine-number speed dial, last 10-number redial, voice-mail waiting indicator, quick-access key for voicemail box, mute & any key answer. Setup menu is in English, Spanish & French.