PC Radio Stereo Headset / 2.4 GHz wireless / 10 m transmission distance / Headset + Microphone + Wireless-Stick (Macbook Air Macbook Pro iMac mit Mac OS Lion Leopard/ PCs mit Linux Ubuntu/ Windows 7 XP PC, iPad 3 with our Premium Camera Connection Kit - detects new hardware automatically. If not detected, please try different USB port.) Transmission frequency: 2.4 GHz Transmission distance: 10 m Transmitting power: 4 dBm Speaker frequency: ca. 20 - 20.000 Hz Running time battery: ca. 8 h