Our Continuous Fogging Spray Bottles incorporate a manually-operated, “Pre-Compression Technology” Trigger Dispenser and a double-layered Plastic Reservoir Bottle to produce a surprisingly powerful, reliable and consistent, aerosol-quality “fog,” without the use or need for electrical components or compressed air. Just a few pulls of the Trigger produces several of seconds of uninterrupted output, which continues regardless of the bottle's angle … no matter if it's held sideways or even upside down. Refills are quick and easy. Just twist the Reservoir Bottle one-quarter turn to remove it from the Trigger Dispenser, fill it with the appropriate PermaSafe product for the task at hand, reattach it to the Trigger Dispenser and you're ready to continue fogging.