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