On the bottom of the gadget There may be the Usb-C charging socket, three vent holes for that built-in battery, the logo as well as reference on the production place. I'm an engineer and Technological Author by trade. My journey in vaping started about 2016, in the days of Tornado https://listingbookmarks.com/story19032803/little-known-facts-about-lost-vape-ub-lite