* Carbon Amplifier
* Compatible with R-Type or 3-wire AT&T, Merlin, System and Definity Phones
* Adjustable volume control

The Tuffset Carbon 2 amplifier is compatible with AT&T phones using the R-type or 3-wire handset: Merlin, Merlin II, System 25, System 75, Definity Systems and ISDN phones. This amplifier is equipped with an adjustable volume control, mute button and headset/handset switch. The Tuffset Carbon 2 amplifier is compatible with any VXI brand headset. 
This product has a two-year warranty.