The Jabra Evolve 20 MS Mono On Ear Headset 4993-823-109 is a high-quality headset designed for computer and networking use. With a sleek black design and a comfortable headband form factor, this headset features a single earpiece and built-in microphone with a boom type for clear communication. It also includes various convenient features such as call functions, adjustable headband, volume control, noise cancellation, and in-line control. The headset offers USB connectivity and has a built-in on/off switch for easy use. Perfect for those looking for a reliable and user-friendly headset for their work or personal use.