- In-line receiver amplifier<br>- Makes low volume <br>- Compatible with electronic and standard telephone<br>- Complete with plug-in power supply<br>- Easy to install<br>- Installs between the handset and telephone<br>- Rotary volume control numbered 1-9<br>- Users with normal hearing should not go above 3<br>- Improves volume up to 20dB<br>- Do not connect directlyto a telecommunication network
