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. One year warranty.
Outgoing voice amplification up to 40dB
Incoming voice amplification up to 18dB
DSP (Digital Sound Processing) technology eliminates virtually all distortion, echo effects and unwanted static commonly found in other ordinary amplified phones
9 photo-memory buttons for one-touch dialing
Two (front and side) visual incoming ring flashers
95+dB super loud ringer with adjustable ringing volume and tone controls