Dual power modes make this a versatile lantern. Plug it into any standard wall outlet using an AC adaptor (not included) to use at home. Or install 4 size "D" batteries (not included) to make the light completely portable. Dimmer switch adjusts from nightlight to super bright, and LEDs last for up to 100,000 hours of use. Great for on the boat, camping, power outages and much more.