The Serene Innovations HD-40S features High Definition Sound (HDS) technology to make even the quietest voice clear and easily audible. Outgoing voices are amplified up to 40dB. Incoming voices can be amplified up to 18dB.
Fanstel EzPro T56 Black Amplified Phone
Clarity Ensemble Amplified Captioned Phone with ClearCaptions
Clarity Amplified Photo Phone P300
Serene Innovations HD-60J Amplified Phone