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.