The Yongnuo YN-900 AC Adapter for YN-900 LED Light is a power switching adapter that you can use to charge the YN-900 LED light from Yongnuo. The AC input voltage range is 100 to 240 volts with an input current of 1500 mA. Its DC voltage range is 3 to 24 volts with a current range of 100 to 4000 mA. The adapter offers protection from short circuits, open circuit, excessive voltage and current to ensure the Yongnue LED light is safe while charging. It also has an MTBF (Mean time between failure) of 50000 hours, so you are assured of long-lasting use.