Specification: Connection: USB (Universal Serial Bus) A Drive free: Plug & play System requirements: Windows 2000, Windows XP, Windows Vista TM, Windows 7, Windows 8 & Windows 10 Compatible with Microsoft software such as Skype Adjustable headphone & microphone volume Noise cancelling Microphone Microphone sensitivity: 40±3d B (0d B=1V/ Pa at 1 K Hz) Headphone Impedance: 150 ohms Headphone frequency range: 100-6600HZ Headphone sensitivity: 100±3d B Environmental noise: = 60d B (A) Lightweight & comfortable to wear Meets the international standards for hearing protection (Less than 118db).