A small white LED mild is behind the lefthand side droplet/air hole. This lights up each time you vape and can flash in the event the vape is depleted. Plug the USB cable into a charger. Join the opposite conclude from the USB cable to a typical USB wall charger. https://micro-bar-disposable-weed18483.idblogz.com/30186081/what-does-micro-bar-disposable-weed-vape-mean