The BugBand portable diffuser is the latest insect repellent technology and is powered by 3 triple A batteries so it can go almost anywhere with you. It’s quiet fan distributes pleasant smelling geraniol vapors protecting up to 300 square feet. Each refillable cartridge lasts 120 hour plus! Red light indicates batteries were inserted correctly. Adjustable air flow lever for infestation levels. Tall tower can fit 3 cartridges. The diffuser has been designed to work indoors, outdoors, in homes, offices, picnics, tents porches, patios, campsites, inside tents, and RVs. Safe when used as directed around food, children and pets. Read and follow package instructions.