The Krown In-Line Telephone Volume Amplifier connects to any landline phone and lets you amplify the phone’s volume up to 20x using the built-in volume control. This device is great for individuals hard of hearing and elderly people. The amplifier requires (1) 9V battery for operation (not included).
Features
- Low battery light indicator
- Easy to use volume slide
- Power button to prolong the life of the battery

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