Serene Innovations HD-40S Amplified Phone
The Serene Innovations HD-40S features HDS (High Definition Sound) technology to make even the weakest voice sharp, clear and easily audible to the other caller. The outgoing voice is amplified up to 40dB. Incoming voices can be easily set to amplify up to 18dB.
More information: http://www.harriscomm.com/index.php/serene-innovations-hd-40s-outgoing-speech-amplified-picture-phone.html