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)