World's first collaborative earphone from Massdrop and HIFIMAN, the Massdrop x HIFIMAN RE00. Driver: 9 mm dynamic, Impedance: 64 ohm, Sensitivity: 100 dB at 1 mW, Frequency response: 15 Hz – 22 kHz, Cable length: 53 in (135 cm), Weight: 0.6 oz (17 g). Available exclusively from Massdrop.