The vehicle-mounted charger is designed with high-quality of IC and optimized circuit. The rated output current reaches 2.1 A. The charger not only charges the Bluetooth headset, but also provides a USB port to charge smart devices, such as smart phones and tablets. The speed of charging is 30% faster than a common vehicle-mounted charger. When the vehicle-mounted charger is used to charge the headset, the LED indicator turns red. After the headset is fully charged, the LED indictor turns blue. The charger is designed with the over-current protection and short-circuit protection functions, which ensure that the charger outputs a safe, stable, and powerful current without damaging devices.