The GoSun Chill is able to be powered by typical 12 V cigarette ports in the car, boat or RV or with the portable PowerBank. It can also be run with the included AC adapter. The Chill has three modes for battery protection to prevent depletion through an integrated LVD (low voltage disconnect). The H setting is for when you are connected to your car. The M is if you were to connect to a lead acid battery. The L is for lithium, so when you are powering your cooler from one of our PowerBanks.