Slender, slick, and full of power, the KandyPens Slim battery lets you stay in charge while vaping on-the-go. A USB charger will power up the KandyPens Slim quickly and conveniently. The KandyPens Slim battery features button-less functionality that only heats waxy oils when you draw from the KandyPens Slim. The universal 510 threading is compatible with the KandyPens Slim or any 510-threaded tank. A slim design is easy to grip and secret away into your pocket. The KandyPens Slim Battery is ideal for wax vaporization that's stealthy and convenient.