Color: black, white Channel: Stereo How to use: Head-mounted 1. Using 57mm16 large drive unit, turbo cavity technology, shocking bass, clear and transparent three-frequency, restore the original sound! 2. Bluetooth 4.1 subverts industry standards! 3. Turbine structure design redefines personality and fashion! 4. The touch of Line-out sharing music like a couple! 5. 40 hours of listening to music, 45 hours of talking, 1625 hours of standby! 6. Global APP controlable Bluetooth headset 7. Support four languages switching.