Instantly Switch Your Headset From Phone to VOIP, Music, or Games. With The Touch Of A Button! . Plus, an audible alert can be heard over the audio in your headset when the phone rings. Simply plug in your phone line, PC sound cards or other audio devices and multimedia headset/mic. Connect virtually any multimedia stereo headset/microphone with 3.5mm plugs. Audible alert can be heard over audio in headset. Lets you listen to stereo from any stereo audio source. No external power required.