Compliant with USB 2.0 Full Speed Allows both parties speak freely without cutting each other off Mute button lets you talk to people on your side without those on the ling hearing Automatically muted when handset on the phone is lifted Automatically prevent howling during usage Allows 4~8 persons jointly in conference and transmit each voice clearly Providing 360* coverage and no need to hover over the unit Compliant with USB Audio Device Class specification v1.0 Full Compatible with Skype Supports MSN, Yahoo Messenger, Net2PhoneK.. Supports Win98 SE/Win ME/ Win 2000/Win XP/ Mac OS/Mac OS X Full Duplex audio, echo cancellation Supports Skype In/out Handsfree Currency: USD Unit Price: Quantity: Delivery: