A uniquely designed discreet 510 threaded Vape Battery system.Allows you to ripped One Cartridge or Two at a time.Hit two carts at the same time! 650mAh Power, 3 click temperature change, 2.5v low, 3.0v, 3.5v. and 4.0v high. Button Draw, 20 minute auto shut off. Fits all sizes of carts, including larger 2 gram tankers.