The Serene Innovations HD-60 Jumbo Key Amplified Telephone with 600 Times Amplification is designed with those suffering from severe hearing loss and low vision. 

Product Features: 

• High-Definition Sound Technology for un-matched clarity, a new standard in amplified telephone technology
• Amplifies incoming sound up to 600 times (over 55+dB), the most powerful in its class
• Selectable Digital Tone Setting allows you to boost and enhance the speech frequencies you can't hear well, making difficult to hear words intelligible again
• Latest Digital Sound Processing technology eliminates virtually all distortion, echo effects and unwanted static commonly found in other ordinary amplified phones
• 'Off-hook alert' provides audible and visual warnings to alert improper hang-up and preventing accidental blocking of incoming calls
• Large and brightly backlit keypad for easy viewing
• 12 one-touch programmable memory buttons
• Two (front and side) visual ring flashers
• 95+dB super loud ringer with adjustable ringing volume and tone controls
• Battery back up (batteries not included) for power outages
• 3.5 mm jack for neck-loop, tele-coil and other assistive accessories
• Hearing aid compatible handset
• One year manufacturer's warranty