The Cannon Fog Machine has an emergency power supply which can last up to three hours, ensuring that the machine can still function during power outages and continue to provide optimal protection to your premises. You can trust that the fog density and level of security will remain effective, as the machine is equipped with an external status indicator to let you know its pulse function is working properly. With a battery backup and standalone operation, you can confidently choose the Cannon Fog Machine for your business security needs. In the event of a power failure, the fog machine will continue to provide extra security and protection to your business without interruption.