• 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.