LogiLink HS0017. Device connectivity: Wired, Device interface: USB, Cable length: 3 m. Ear coupling: supraaural, Impedance: 32 Ом, Headphone sensitivity: 108 dB. Microphone sensitivity: -36 dB, Microphone input impedance: 2200 Ом. Weight: 0.433 kg. Mac operating systems supported: Mac OS X 10.4 Tiger