Plantronics Blackwire C435 (85800-01) PC Headset. The headset's modular over-the-ear design can be worn with two ear buds for stereo, or converted to one ear bud for mono use depending on the users preference. The ultra-discreet design and superior audio quality you've come to expect from Plantronics make this headset ideal for video conferencing, PC telephony and multi-media applications. Even more, it comes with a rugged protective carrying case so you can easily take it with you. With the Blackwire 435, you don't have to compromise between style and sound quality.