510 Thread Variable Voltage battery! With three voltage settings, pre-heat function, and LED lighting, this battery is the ultimate companion for your 510 cartridges. USB Charger Included Preheating Function Variable Voltage Battery 1. Five touch for power on/off 2. Three touch to adjust the battery voltage 3. Two touch preheating function 4. Pre-heating function Oval button controls three voltage settings: 2.1v - 2.8v Compatible with: Elite, Elite Live, Essentials Available in: black