Accessory handset features DECT 6.0 technology to provide a greater call range without interfering with wireless routers. Full-duplex speakerphone increases participation by allowing both ends to speak and be heard at the same time for conversations that are more true to life. Caller ID allows you to see the name, number, time and date of incoming calls at a glance. 100-name/number phonebook directory lets you quickly store and dial frequently called numbers. Handset also includes six-party conferencing, call recording, voice prompts, hold reminder, ringer volume control and more. Accessory handset is designed for the VTech Four-Line Small Business System Main Console (sold separately).