On The underside on the product there is the Usb-C charging socket, 3 vent holes for the built-in battery, the logo and the reference to your manufacturing space. Change airflow = move the airflow lever to the proper for a tighter airflow or to your left for a more open https://socialfactories.com/story4437559/the-5-second-trick-for-lost-vape-thelema-solo-dna100c