Serene Innovations UA-45 Universal Phone Amplifier

This universal telephone amplifier converts virtually any corded home or business phone into an amplified telephone.

Features:

• Amplifies incoming voices up to 45dB
  
• LED indicators for on/off headset and headset mode
  
• Two-way converse while in Boost mode
  
• Digital Sound Processing technology eliminates virtually all distortion echo effects and unwanted static
  
• Digital Tone Enhancement allows you to boost and enrich the speech frequencies you can't hear well
  
• Automatic Gain Control optimizes the sound level for superior listening comfort
  
• Automatic Volume Control
  
• Auto shutoff
  
• AC adapter jack (not included)
  
• 9V battery (not included)

[Click for user manual]"