Deluxe Amplifier/Headset Kit With Headset Stand is 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). Provides microphone and speaker amplifications with adjustable volume controls. Quick disconnect mute function lets user leave their desk without removing headset or disconnecting caller. Amplifier/headset kit includes online and low-battery LED-indicators, 10' cord, 4P4C RJ-11 telephone plug, automatic battery-power-saving function. Kit is powered by two AA batteries (sold separately).