- Accessory handset only�requires an SN5127 or SN5147 series phone to operate - Photo dial - Never forget whose number is whose. Program four frequently dialed phone numbers and attach a photo to each one for convenient speed dialing. - Visual ringing indicator - A light on the top of the handset flashes when the telephone rings signaling an incoming call. This feature is especially helpful for those who are hearing impaired. - Caller ID announce - Screening calls has never been easier. The handset announces the name of the caller so you don't have to scramble for the handset to see who's calling. - Full-duplex handset speakerphone - Enjoy a speakerphone that can keep up with your calls. Increase participation by allowing both ends to speak and be heard at the same time for conversations that are more true to life. - ECO mode power-conserving technology - ECO mode manages power consumption so the system uses less energy and you get the best battery life. - DECT 6.0 digital technology - Volume control