Standard 510 Thread lithium battery with 3 settings. Silver with a lotus flower decal. cartridges come in CBD dominant or equal ratios 1:1, 2:1, 4:1, 8:1,18:1 Care by design mission: "With five CBD-to-THC ratios, patients can find the right product to suit their specific condition and personal preferences. Our CBD oil is extracted from sustainably grown CBD-rich cannabis in Northern California’s Emerald Triangle. The CBD is safely extracted using the same method used to decaffeinate your coffee. And our products are formulated in a fully equipped lab to ensure the highest quality and best results."