... . Ideal for entertainment, conference, lecture, presentation etc.1.1 2.4G wireless technology transmission, longest distance up to 15 meters ... array keypadOS CompatibilitySupport Windows98, 2K, XP, VISTA and Windows7 Android 2.3, MAC.OFNSupport optical finger navigationRF & BT working distance ... and the headset turned around its center in the xy-, yz- and xz-plane respectively in an anechoic chamber ...