The ProVari 3 is a powerful microprocessor controlled PV that lets you adjust and fine tune the device to your exact preferences by adjusting the power (in voltage or wattage), along with a number of great new features never before seen. The ProVari 3 uses the latest technology to bring you some new and exciting features. The ProVari 3 has regulated power output which keeps the voltage or wattage the same with each puff regardless of your remaining battery power. As the battery drains, the device will keep the power output consistent, giving you the perfect vapor all day long. Now you can dial-in the perfect settings for your tank or atomizer, and e-liquid!