Serene big button amplified talking CID cordless phone- Amplifies incoming sound up to 55 + dB 600 times- HDS hi-definition sound technology makes every word crisp and clear- Digital tone control enhances voice tone and pitch making difficult to hear words easy to understand- Talking caller ID with call-waiting announces the callerFTs number- Brightly back-lit talk-back keys confirm if youFTve perssed the desired number- One-touch call-for-help button for hands-free emergency calls- 8 one-touch speed dial buttons for easy calling- Visual voice mail and missed call indicator- High performance speakerphone- Bright visual ring flasher and super loud ringer 95 + dB on handset and base- DECT 6.0 technology for superior range and interference-free calls- Battery back-up for full operation during power outage- Output jack for tele-coil, neck-loop and other assistive accessories for hearing aid and cochlear implant users- Hearing aid compatible handset- Expandable up to 5 handsets