This amplified phone is designed for those who are considered to have mild to moderate hearing loss. The XL-40 Amplified Telephone offers the latest in telecommunication technology to give you louder, clearer and more understandable conversations. No more missing words and frustrations. The XL-40's powerful amplifier not only increases the incoming voice by 40+ decibels, it even allows you to adjust the tone to your hearing needs. Its advanced electronic circuit design eliminates unwanted background noise to make every word clearer and easier to understand, all without any feedback or distortion. It has a super loud ringer with selectable ring tones. You'll never miss another call again!!! And, the XL-40 gives you extra large buttons with back lighting and high contrast graphics for optimum visibility and dialing ease. Additional features include: Digital Signaler Processor minimizes background noises, Anti-Feedback Filter eliminates feedback and distortion, 12 memory dialing buttons,adjustable volume and tone control, extra loud ringer 95+db,Hold/Redial/Flash Buttons, Visual voice mail/unanswered call indicator, Desk or Wall mountable, A/C Adapter (included) with battery backup (4) AA Alkaline batteries (not included). 3.5mm jack for neckloops and other assistive listening devices .Requires an Rj11 modular phone jack and a standard 120 volt electrical outlet.Hearing aid compatible.