Rapoo 2.4GHz Wireless High-Quality Stereo Headset with Rotatable Noise-Proof Microphone for PC & Notebook (H8030 Black) Reliable 2.4GHz wireless connection provides up to 10m working range . You are free to enjoy high-quality, stereo audio. The speaker adopts COM- Ti membrane vibrating technology , the treble is pure and bright, the bass is mellow and thick. Noise-proof microphone provides you with clear phonetic communications by picking up your voice. Rotating the microphone down to the communication position,you can make calls,Rotating it up goes to the mute condition. System Requirements: Windows XPWindows VistaWindows