HamiltonBuhl Soundscape USB Headset with Mic and 5.1 Surround Headphone_Speaker - 40mm Mylar Headphone_Magnet - Ferrite Cobalt Headphone_Impedance - 32 Ohms +- 15% each side Headphone_Frequency_Response - 20-20,000 Hz Headphone_Sensitivity - 110dB SPL +- 3dB at 1kHZ