Sunnyside Core Battery- White

Fits most 510 thread cartridges (included cartridge is non-functional and for merchandising purposes only) Powered by a high-quality 320mAh lithium-ion rechargeable battery core 3-LEDs indicate battery life and power settings Four (4) power/voltage settings (2.4V Green, 2.8V Blue, 3.2V Yellow, 3.6V Purple) USB magnetic charging port + cable Click 5 times to turn off or on, click 3 times to change voltage setting