What's in the box: 20/20 Hieffect Battery and USB charger, requires a 510 thread cartridge, compatible with 20/20 Vape cartridges. Battery holds a 4hr charge! Turn on/off by pressing button 5 times. Adjustable voltage; adjust by pressing the button 3 times in succession. 20/20 Hiieffect premium vape battery comes in a sleek matte black and golden yellow button which illuminates when vaping, stylish and incognito for outside use.