APM 571180. Device interface: 2x 3.5 mm, Cable length: 1.9 m. Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом, Headphone sensitivity: 89 dB. Microphone frequency: 100 - 10000 Hz, Microphone sensitivity: -54 dB, Microphone input impedance: 2200 Ом