The Clarity ALTO-PLUS is an Amplified Corded Phone which amplifies only the sounds you want to hear while reducing unwanted background noises. With up to 53 decibels of amplification , large high-contrast buttons and 4" backlit screen with large font, the Clarity ALTO-PLUS is an ideal solution for those with mild-to-severe hearing loss or low vision. The Clarity ALTO has an adjustable incoming volume control which lets you select the loudness to suit your hearing.The Clarity SR100 Super Phone Ringer is ideal for a user who is at home, in the office, or traveling. The Ameriphone AME-SR100 is designed for people suffering from moderate to severe hearing loss.Clarity ALTO-PLUS Features:- Amplified Big Button Corded Phone- Talking Caller ID- Amplified Volume - Up To 53dB- Tone Control Lets You Customize The Amplifier For Optimum Clarity- Amplified Ringer - Up To 100dB- Talking Caller ID- 3-Line Backlit LCD Display- Speakerphone- Big Button Illuminated Talking Keypad- Easy-To-See Oversized Keypad Buttons- 3 One-Touch Memory Buttons- Visual Ringer- 3.5mm Neckloop Jack- 2.5mm Headset Jack- Jack for Optional Vibrating Pad- Handset Volume Control- T-coil TechnologySR100 Features:- Super Loud Phone Ringer- Designed for People with Moderate to Severe Hearing Loss- Adjustable Ring Volume Control up to 95 DB- Adjustable Ring Tone Control to Best Suit Your Hearing- Dual Modular Phone Jacks for Easy Plug-in Connection- No Battery Necessary, Powered by Telephone Line