Brand: SonyType: headphones Colour: BlackNoise-canceling function. You can also use as normal headphone.Model: Sealed dynamic type. Driver unit: 30mm dome type. Sensitivity: 115dB/mW (when the power is ON), 110dB mW (when the power is OFF).Magnet: Neodymium. Play frequency band: 10Hz - 22,000Hz. Impedance: 220Ω(when the power is ON), 45Ω (when the power is OFF). Maximum input: 28mW.Cord Length: about 1.2m. Code type: Y type. Input Plug: Gold-plated L-type stereo mini plug.Weight: about 150g (excluding code, including batteries). Power supply: AAA batteries. Battery duration: 80 hours (when alkaline batteries use), 40 hours (when manganese batteries use). Accessories:Plug adapter for aircraft. Folding.