BRIEF FEATURES: Variable Voltage: voltage can be adjusted from 3.3 6.0 volts in .1 volt increments. Variable Wattage: Wattage can be adjusted from 3.0 15.0 W in .5 watts increments. Short Circuit Protection. Reverse Battery Protection Circuit. Battery Voltage Detection. Resistive Load Detection ( Ohms meter ). ON/OFF battery switch. LED Battery Power Display. Low Voltage Warning. Overtime Vaping Warning. Telescopic Tube supports 18350, 18500 or 18650 batteries. Battery safety protection. 510 and eGo threaded, compatible with many popular atomizers, cartomizers and clearomizers ( Thread fits iClear10, iClear16, iClear30, CE4, CE5, eGo, T2, T3, VIVI NOVA, 510, etc ). Remembers last set voltage or wattage when switching batteries. Built-in 3 digit display (Ohms meter, Volts /Watts, Atomizer voltage output).