Wireless 5.0, low power, 10-15m stable signal. Advanced bone conduction, more powerful. IPX5 waterproof, enjoy your workout at will. Titanium alloy memory steel wire frame, 360-degree free bending, comfortable and secure fitting. Bone Conduction Headphone Parameters: Product model: RB-S33 Bluetooth version: V5.0 Transmission distance: 10m Drive unit: composite titanium speaker→16mm Frequency response: 20Hz~ 20KHz Rated power: 0.5w Charging time: 2h Impedance: 8ohm Product net weight: 35g Charging compartment size: 135*98mm