Large capacity charging compartment, 5.0 low power consumption is the core technology of the headset , built-in large-capacity lithuum battery, to prorect your wireless music Small size loud field, the new 5.0 bluetooth chip, although the f9 is petite, it has a wide sound field and detailed details Metal material+ABS material Prevent product damage during transportation 100% Brand new, good quality, new design iPX 3 waterproof, can be washed directly, high quality control, reach ipx, waterproof, no fear of sweating , no fear of washing.syi