Plantronics Blackwire C435 corded stereo (earbuds for both ears) USB computer headset. Simple plug-and-play USB set-up. Excellent quality stereo sound in a discreet, low-profile style. The Blackwire 435 headset can be worn with two ear buds for stereo, or converted to just one ear bud for mono sound based on user's preference. Includes handy carry case (see inset photo) for convenient portability. Wideband support for best PC audio telephony; noise-canceling boom-style microphone; enhanced Digital Signal Processing (DSP) technology for natural conversations. Call controls on the cord for call answer/end, mute and volume up/down. Covered by 1-year warranty.