Philips SHM7410U. Device connectivity: Wired, Device interface: 3.5 mm, Cable length: 3 m. Acoustic system: semi-open, Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом. Microphone frequency: 50 - 15000 Hz, Microphone sensitivity: -42 dB. Gross weight outer carton: 2.21 kg, Gross weight packaging: 0.28 kg, Height outer carton: 218 mm