NOTE: This charger only have charging function. Designed for Garmin Vivosmart HR and HR+. Extra replacement charging cable to give your garmin wristband a boost in the office,at home, in car or in travels. Voltage Regulator ( PTC ) Inside: Built-in overcurrent protection and overvoltage protection protect your devices against over-heat, over-current, and over-charging. Package Include: 1*charger ( the charger and the USB cable are non-detachable).