Serene high definition amplified telephone- Hi-definition sound technology for panoramic speech clarity- 55+dB amplification increases incoming sounds up to 400 times louder- Digital tone settings make similar sounding words distinct and easy to understand- Auto In.off-hookIn. warnings to prevent unknowingly blocking incoming calls- High-definition sound technology for unmatched clarity, a new standard in amplified telephone technology- Amplifies incoming sound up to 400 times, the most powerful in its class- Adjustable digital tone control lets you enhance selectable sound frequencies to match your hearing, making difficult to hear words intelligible again- Latest digital sound processing technology eliminates virtually all distortion, echo effects and unwanted static, commonly found on other amplified phones- Auto In.off-hookIn. warnings to prevent unknowingly blocking incoming calls- Jumbo keypad makes it easy to see and dial- 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- 3.5mm jack for neck-loop, tele-coil and other assistive accessories- Hearing aid compatible headset