Compatible with: 510 Tanks A simple variable voltage vaporizer with 510 threading that comes in beautiful retail ready packaging. The voltage settings are easy to change by simply clicking the button 3 times. The slim design of this battery tapers off to help make any 510 cartridge sitting on top of it look great. The package includes a USB charger. Battery Capacity: 350 mAh Threading: 510 Includes USB Charger: Yes Power Method: 5 button click on/off Variable Voltage: 3 button click Variable Voltage GREEN = 3.4V BLUE = 3.7V RED = 4.0V