Butane cartridge heats the repeller mat and disperses repellent into the air, making an insect-free zone for your campsite or backyard Max Life repeller mat and butane cartridge provide up to 12 hrs. of protection; replacement repellent and butane cartridges sold separately Evaluated by the EPA for safety and effectiveness, allethrin insect repellent is the synthetic form of a natural repellent found in chrysanthemum plants Lantern generates up to 220 lumens of brilliant white light with 4 brightness settings 4 AA batteries (sold separately) power the lantern for up to 10 hrs. on the high setting