No batteries, disposable –this glow is good to go with H2O. Just wet it for LED that lasts for days. Keep handy at a camp site, in the car, and for any emergency. Activates in 15 seconds by wetting the base. No battery, plugin or power source required. Runs for 72 hours total; Switch off to extend time. Perfect for power outages, blackouts, emergency. Have in case of disaster, accident, hurricane. Compact size ideal for pocket, pack, first-aid kit. Take camping, hiking, in auto glovebox, travel. 2 LED lamp bulbs; On/Off power button on top. Reliable, rugged plastic casing, withstands a drop. Nearly unlimited shelf life from new; disposable. Remove seal for water-activated cell technology.