Amplifies incoming sounds up to 53 db. And outgoing speech up to 15 db.</br>Digital clarity power incorporates hearing aid technology for clearer call quality</br>Extra loud ringer volume (100 DBA)</br>Battery backup lets you make calls when the power goes out</br></br>Product Description</br></br>Amplify incoming sounds up to 53 dB and outgoing speech up to 15 dB with the Clarity 54005.001 Alto Amplified Corded Phone. This corded phone incorporates hearing aid technology for a clearer cell quality.</br><br/>http://www.amazon.com/gp/product/B00AZR2IU8