Brand: SonyType: headphones Colour: Black30mm driver unitNew Vibration function for bass you can truly feelElectro Bass Boost amplifier for extra heart-thumping bass60 hours battery lifeWorks even when battery is depleted (passive operation)Comfortable ear cushionsType ClosedDriver Unit 30mm DynamicFrequency Response 5Hz-22,000HzSensitivity 100dB/mWImpedance (at 1 kHz) Bass Boost ON 100 Ω, Bass Boost OFF 40 ΩCable 1.2m Y-TypePlug L-shaped Gold-plated Stereo MiniApprox. Weight (excl. cable) 273g incl. batteryHeadphone Power Indicator LED (green)Batteries DC3.0V : Dry Alkaline Battery(Size AAA)x2Battery Life Max. 60 hours (1kHz, 0.1mW+0.1mW output), 20 hours (100Hz, 0.1mW+0.1mW output)Passive Operation Yes (Bass Boost OFF)