The Exxus Slim VV Preheating Battery is a compact variable voltage device. Featuring a seamless design, balanced power, and adjustable voltage. Looking for a device with low voltage settings and a ten-second heat up interval, this device ticks all those boxes. The voltage ranges anywhere from 2.6 all the way to 4 Volts. The units incorporated battery charges easily with the included USB charger. Able to hold up to 280mAh of power, it gives the user access to several sessions in one charge. Once activated, the device reaches temperature and vaporizes essential oils in ten seconds. The female attachment port comes with 510 threading to fit most cartridges. Each package comes with one device as well as a compact USB Port Charger.