R-WH is a revolutionary 8 driver units concept for music headset by bluedio. Woofer and tweeter are all made up of independent speaker. Ensure its powerful low frequency sound effect, clear mid range and treble, it is absolutely a wise choice for audiophiles. R-WH Technical Specification Distortion: 0.2% (THD) Maximum Output Power: 50mW Input Power: 30mW Maxim power amplifier Frequency response:5-25kHz Sensitivity:105±3dB Body Size:7.48x7.48x2.28 inch Box Size:11.02x6.49x3.62 inch Accessories: Bluedio R-WH headset 1pc 1.5m audio cable(for Apple and Samsung devices) 1pc 1.5m audio cable 1pc Extension cable for desktop computer 1pc Pouch 1 pc