GN 9330 USB is for use with IP telephony – and the first wireless office headset to offer wideband audio. A 6.8 kHz frequency bandwidth, twice as large as that of traditional telephony, enables you to get your personality across, making all your IP business conversations more productive. The GN 9330 USB headset connects effortlessly and quickly to your computer. Simplistic, intuitive headset controls make it easy to operate and with a weight of only 26 grams you’ll forget you are even wearing it. For Softphone (Skype, XTen, etc.) Only (on a PC/MAC via USB Plug). If you want to use it on a Phone : choose : GN9330e (DECT) or GN9350e.