- 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- One (1) year limited manufacturer's warranty Product Type: Standard Phone Speakerphone: Yes Product Type: Standard Phone Manufacturer Part Number: 54005.001 Speakerphone: Yes Limited Warranty: 1 Year Manufacturer: Poly Product Name: Digital Extra Loud Big Button Speakerphone Product Line: Alto Brand Name: Clarity Brand Name: Clarity Product Family: Alto Total Number of Phone Lines: 1 Total Number of Phone Lines: 1 Hearing Aid Compatible: Yes