Massdrop HIFIMAN HE-4XX Planar Magnetic Headphones ————- Contents: Come with accessories in retail box. New Opened Box Condition. ————- Massdrop x HIFIMAN Open principle Planar magnetic drivers Exclusive midnight-blue colorway Soft-touch matte finish Spring steel and hand-stitched protein leather headband Focus-A hybrid ear pads Adjustable sliders Steel gimbals and Allen screws with black oxide finish Silver printing Laser-etched serialization Frequency response: 20 Hz–35 kHz Sensitivity: 93 dB Impedance: 35 ohms Cable: 4.9 ft (1.5 m), remova