TIA-4953 certified for mild, moderate and severe hearing loss- Amplifies incoming sounds up to 53 decibels and outgoing speech up to 15 decibels- Digital Clarity Power incorporates hearing aid technology for clearer call quality- Extra loud ringer volume 100 dBA- Clarity AudioCenter featuring ergonomic volume and tone control- Built-in speakerphone- Soft touch backlight keypad- Ten 10 one-touch speed dial memory buttons- ClarityLogic remote diagnostic service programs your phone at the touch of a button- Clarity VoiceAssist for talking keypad and talking Caller ID- Oversized bright visual ringer- Headset, neckloop and bedshaker ports – Battery backup lets you make calls when the power goes out- TIA-1083 compliant for hearing aid compatibility.