Hear clearly with this Telephone Voice Amplifier. The adjustable amplification level lets you choose from a little amplification

Hear clearly with this Telephone Voice Amplifier. The adjustable amplification level lets you choose from a little amplification or maximum decibel boost. A convenient on/off switch turns it off when it's not needed. Just plug it into your phone cord and into the back of your phone. Requires 2 AAA batteries (not included) Not compatible with cordless phones. 2-3/4"L x 2-3/4"W x 1"H.