The Plantronics Blackwire 3225 is a USB wired headset that has the ability to be used on a mobile phone or laptop with the 3.5mm cable. The USB controller allows you to adjust the volume up, volume down, mute on/off, as well as answer/end phone calls while away from the desk. There is a quick disconnect feature on the headset so you can leave your headset plugged into the computer and be able to leave your headset on and be able to step away from the desk to grab coffee or take a break.