Tune out the world, tune in full-spectrum stereo music and conveniently switch to calls on your music-enabled phone. Innovative stereo ear buds seal out noise and seal in sound, while AudioIQ two-way noise reduction technology digitally enhances sound quality on both sides of the call. Convenient one-touch buttons let you control calls and music from the headset. On the train, on the road, on the move - the Plantronics Voyager 855 convertible headset delivers outstanding audio performance for calls and music.