Why buy another headset for your phone when you already have a PC headset? Use your existing PC computer headset that has 3.5mm mic/audio plugs with your home, office, or cell phone that has a 2.5mm plug. Also works with XBox 360 controller so you dont have to buy an XBox headset. A big productivity enhancer for home businesses, sales people, road warriors, or anyone who is on the phone all the time, but doesnt want to carry two headsets, one for the computer, and one for the phone. This amazing headset adaptor converts the dual headset 3.5mm plugs to to a standard single 2.5mm phone plug, allowing you to use your favorite computer/laptop headset with your phone or cell phone. This adapter is designed for use with headsets that have two 3.5mm plugs; one for the microphone and one for the headphones/earpiece(s). For stereo PC headsets, outputs binaural sound (youll hear sound in both ears).