Philips SHG8000. Device connectivity: Wired, Device interface: 2x 3.5 mm, Cable length: 2 m. Acoustic system: semi-open, Headphone frequency: 20 - 22000 Hz, Impedance: 28 Ом. Microphone frequency: 100 - 10000 Hz, Microphone sensitivity: -40 dB, Microphone input impedance: 2200 Ом. Packaging width: 240 mm, Packaging depth: 110 mm, Packaging height: 290 mm. Cable type: Copper, Number of products included: 1 pcs, Volume control: Digital