Drop x HIFIMAN HE-X4 Planar Magnetic Headphones - Black Description: Condition: New Opened BoxFeatures: Drop + HIFIMAN Headphone type: Open-back Ear coupling: Over-ear Drivers: Dual-magnet planar magnetic drivers Sensitivity: 91 dB Impedance: 25 ohms Frequency response: 20 Hz – 20 kHz Spring steel and hand-stitched protein leather headband Focus-A hybrid ear pads Adjustable sliders Steel gimbals with black oxide finish Black printing Laser-etched serialization Cable: 4.9 ft (1.5 m), detachable Plug: