CLARITY D702C4 59473.000 D702 + 4 D702HSMinimizes background noisesEliminates feedback and distortionManaging soft/loud sounds to produce clarityAmplifying incoming sound up to 30 decibels or 6 times louder than a standard home phoneOffers 4 tone settings to customize your listening experienceUtilizes DECT 6.0 technology for clear, interferencefree communicationEasy to see high contrast numbersContoured keys with softtouch material for comfortBacklit keypad that is easy to see at nightLarge font and high contrast caller ID screenExpandable up to 5 handsets (model # D702HS)