Creative Labs HN-900. Device connectivity: Wired, Cable length: 1.5 m. Ear coupling: circumaural, Headphone frequency: 20 - 20000 Hz, Headphone sensitivity: 100 dB. Microphone frequency: 100 - 10000 Hz, Microphone sensitivity: -38 dB, Microphone input impedance: 2200 Ом. Battery life (max): 40 h, Compatible battery sizes: AAA. Weight: 0.168 kg