GN 9330 is designed to work with traditional desk telephones bringing hands-free convenience and superior audio quality to conventional office telephony. GN 9330 provides you with clear, peak-free sound. Noise-cancelling micro­phone technology ensures your voice is always transmitted clearly, even when you’re moving through noisy areas. The GN 9330 headset connects effortlessly and quickly to your telephone. Simple, 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 IP Phone Only. If you want to use it on a softphone (Skype, XTen, etc.) : choose : GN9330 (USB) or GN9350e.