"Features: 1. Variable Voltage:. 3.0 - 6 volts 2. Variable Wattage:. 3.0 - 15 W 3 .Short Circuit Protection; 4. Reverse Battery Protection Circuit; 5. Resistive Load Detection (Ohms meter); 6. ON / OFF battery switch; 7. OLED Battery Power Display; 8. High compatibility 510/eGo Connector: 9. OLED display (Ohms meter, Volts / Watts,voltage output) 10.Panasonic 18650 batteries 3400mah 11.power bank function http://www.waideacig.com/"