DESC: Clarity Power Technology increases the volume of high frequency sounds, the kind of sounds many people cannot hear clearly on the phone. Increases incoming sounds up to 30 dB. Features a bright visual ringer that allows you to see the phone ring in both the base and the receiver. Also has an extra-Loud Ringer - Easy to hear ringer in both the base and handset, notifies you of incoming calls. Large Lighted Keypad - Easy to dial - even in the dark. 10 Memory Keys - Stores frequently called numbers for dialing ease. 3 Emergency Buttons with one touch speed dialing.