G-Sound 15.08.1324. Device connectivity: Wired, Device interface: 3.5 mm, Cable length: 2.5 m. Ear coupling: supraaural, Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом. Microphone frequency: 100 - 10000 Hz, Microphone sensitivity: -54 dB, Microphone input impedance: 2200 Ом. Cables included: 3.5mm. Volume control: Rotary