The Plantronics Blackwire C510-M is a corded USB headset with Smart Sensor technology intuitively help you manage PC calls. Simply put the headset on to answer a call and you'll hear every word thanks to its premium wideband audio quality. And with ultra soft leatherette ear cushions and a lightweight headband, you'll enjoy all day comfort and a secure fit. When work takes you on the go, simply fold the ear cushions flat and store in the included carrying case. Durable and portable, The Blackwire C510-M offers all day comfort for juggling PC calls and multi media providing corded reliability.