Amplifier and Headset Kit with oversized ear pad includes amplifier, headset and accessories. Compatible with most single-line, multi-line telephones. Allows PC headset connection for supporting multimedia applications. Connects to PC soundcard and other audio devices via two 3.5mm plugs (microphone and speaker). Offers microphone and speaker amplifications with adjustable volume controls. Quick disconnect mute function allows you to leave your desk without removing headset or disconnecting caller. Headset features oversized ear piece for more comfort and richer sound. 7'4" cord. 4P4C RJ-11 telephone plug. Automatic power save function. Powered by two AA batteries (sold separately).