This is a magnetic USB micro b plug! They pair with the Black Woven USB A or Type-C to Type-C Cable with Magnetic Tip . Plug your microUSB power (or data!) cable into one end, then insert the little magnetic nub into your device's charging port. Now you basically have a quick-detach microUSB connector with a magnetic alignment. Easy to plug in whenever, no worries if the cable is yanked or twisted.