Universal Home Phone Amplifier - Model UA-45

Amplifies incoming voices to 45+dB so you can hear better on the phone. Selectable Digital Tone Enhancement enhances the speech frequencies you can't hear well, making difficult words understandable again. Automatic Gain Control optimizes sound level for superior listening comfort. Latest Digital Sound Processing (DSP) technology eliminates most unwanted distortion, echo effects, and static commonly found in ordinary amplifiers. Works with virtually all corded landline telephones, connecting between the handset and base. Battery (9V) for power outage backup not included; optional AC Adapter sold separately.