The Plantronics Blackwire C520-M is a high-quality "On-Ear" headset from the 500 Series, designed for use in laptops and desktop computers. With its sleek black color and modern design, this headset features a single earpiece with a headband form factor for a comfortable fit. It is equipped with smart sensor wireless technology and connectivity via USB for convenience. The Blackwire 520 model offers HD voice, built-in on/off switch, stereo sound, in-line control, active noise cancellation, and a variety of useful features such as adjustable headband and volume control. Ideal for professionals seeking a reliable headset with advanced capabilities.