Massdrop x HIFIMAN HE4XX Planar Magnetic Headphones - Black Description: Condition: New Opened BoxFeatures: Drop + HIFIMANOpen principlePlanar magnetic driversExclusive midnight-blue colorwaySoft-touch matte finishSpring steel and hand-stitched protein leather headbandFocus-A hybrid ear padsAdjustable slidersSteel gimbals and Allen screws with black oxide finishSilver printingLaser-etched serializationFrequency response: 20 Hz–35 kHzSensitivity: 93 dBImpedance: 35 ohmsCable: 4.9 ft (1.5 m), removablePlug: ¼ in (6.35 mm)Weight: 13.1 oz (370 g)In