About this item Reliable 2.4G wireless connection up to 8 meters. You are free to enjoy high-quality, stereo audio. 3.5mm jack and USB dual input mode let your headphone can fit almost all audio sources, like phones,mp3,or PC etc. The hidden omni-directional microphone will automatically pick up your voice with remarkable clarity. The device also works in wired mode by connecting the 3.5mm to USB audio cable. Useful when you run out of power. An empty battery will never stop you now. High-performance rechargeable lithium battery guarantees 6 hours of high quality music enjoyment, after only 2 hours charging.