Description:Useful tool: This motorcycle helmet earphone makes you can answer a phone call more conveniently during riding.Bluetooth-compatible 5.0: This motorcycle helmet wireless headphone supports about 10 to 15m distance, and the signal is fast and stable.800mAh battery: This motorbike helmet earphone can work for a long time, providing about 40 hours of phone call time.Water resistant: This motorcycle helmet wireless headphone features IP67 waterproof, so the headphone can work properly on a rainy day.Useful design: This motorcycle helmet bluetooth-compatible earphone allows you to use it while charging, making it more convenient to use. Specification:Size(LxWxH): Approx. 86x40x20mm/3.39x1.57x0.79 inch.Color: Black.Bluetooth-compatible version: 5.0.Battery: Li-polymer battery, 800mAh(Built-in).Working time: About 40h.Standby time: About 300h.Charging time: About 2.5h.Charging port: Micro USB.Power: 5V, 1A.Transmission distance: Approx. 10-15m/32.81-49.21ft. Note:There might be a bit of color distortions due to different computer resolutions.There might be a slight error due to different hand measurements.