NOX Krush. Device connectivity: Wired, Device interface: 2x 3.5 mm, Cable length: 2.2 m. Ear coupling: supraaural, Acoustic system: semi-open, Headphone frequency: 20 - 20000 Hz. Microphone connectivity: 3.5 mm. Weight: 0.286 kg. Number of products included: 1 pcs, Volume control: Rotary