TekNmotion Airhead 1000 Wireless Headset for MAC & PC (TM-AIR100A) 2.4GHz wireless headset for music, chat and gaming Media controls on the left earcup - supports Windows Media Player, iTunes, Real player Rechargeable Lithium Battery with 10-12 hours of operating time 40mm speaker drivers - Frequency response 20Hz 50kHz, Impedance 28 ohm, THD 0.1% at KHz 3.5mm line-out jack to connect with speakers or second headset USB Powered - No additional power source needed