On the bottom in the product there is the Usb-C charging socket, 3 vent holes for your built-in battery, The emblem and also the reference to the generation region. I am an engineer and Technological Writer by trade. My journey in vaping began all-around 2016, in the days of Twister https://lost-vapestore.com/product/lost-vape-thelema-solo-dna100c-mod/