Bluedio R2-WH Wired Headphones (Grey) Bluedio 8 driver units: 2 50mm 50 woofer and 6 32 3D speakers High fidelity monitoring headset Wide range frequency response unique PPS8 effect of Bluedio, to simulate 5.1 channels surround sound effect With adjustable and foldable slider of R2-WH, plus light weighted,