Type: Headset Speaker: 40mm; Sensitivity: 108dB with tolerance of 3dB; Frequency Response: 15Hz-20, 000Hz; Impedance: 32ohm; Rated Power: 100mW; Power Capability: 1000mW; Plug Type: Stereo 3.5mm Notes: 1) Fold-endurable head-band makes it comfortable to wear, while the ergonimically designed ear-cups comfortably cover your ear up for better noise isolation and total immersion in the optimal musical performance; 2) Single-side cable design avoid twisting. Volume is adjusted by route control which is very convenient; 3) Humanization swiveled design of mic enables chat on the internet easily; 4) 40mm Hi-Fi speaker with clear alt and dynamic undertone brings you into a clear and natural musical world; 5) All raw materials including working process complies with EU ROHS directive. And we can provide relative test report issued by authority, which ensure a safe secure use.