Amplifies incoming sound up to 40 decibels Four tone settings to customize your listening experience Amplified digital answering machine making it easier to listen to messages Large high contrast CID display Extra loud and clear speakerphone for hands-free conversations Large keypad with high contrast numbers Five speed dial buttons to store important numbers Ten loud ringer melodies with six levels of volume CID display lights up as super bright visual ringer Expandable up to four cordless handsets (model #D703HS)