Value 15.99.1303. Device connectivity: Wired, Device interface: 2x 3.5 mm, Cable length: 1 m. Ear coupling: intraaural, Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом. Microphone frequency: 20 - 16000 Hz, Microphone sensitivity: -58 dB. Volume control: Rotary