With Plantronics new line of corded headsets from the Blackwire® 500 series, you get the comfort and versatility you would expect from Plantronics. The Plantronics Blackwire C520 Premium audio headset contains an industry first with Smart Sensor™ technology that gives you the all day comfort you need. This headset gives you the versatility to switch between audio and calls and allows you to mute or change the volume with a simple push of the button located on the cord. The comfort padding on the headband and leatherette ear pads make sure you stay comfy and secure all day. Included is a carrying case to make sure your headphones stay protected when not in use(and yes, the ear pads even fold in for easy and convenient storage). The C520-m model includes 2 ear pads for the ultimate audio experience.