Rapoo 2.4Ghz USB Wireless Headset with Microphone (H3050 Blue) Reliable 2.4GHz wireless connection provides up to 10M working range. You are free to enjoy high-quality, stereo audio The hidden omni-directional microphone automatically picks up your voice with remarkable clarity Recharge by using the universal mini-USB cable - even while your music is still playing 2-hour charging,6-hour enjoyment The device can works in wired mode by connect the audio-USB cable when you run out of battery. you will never interrupted by empty battery Wireless Technology: 2.4Ghz RF Host Interface: USB Form Factor: Semi-open