This is a portable magnetic USB wireless charger, USB port charger, plug and charge, easy to charge via adapter, PC and laptop, the pocket size of portable charger will take you with you when you are outdoors , easy to put into your pockets and bags, with strong magnetic adsorption, safe and reliable. High efficiency and fast charging speed. Set up multiple protections, built-in over-current, over-voltage, short-circuit, over-temperature protection, to provide a safe environment for your watch and charger.