There are various criteria that must be followed when flying to ensure that an aircraft arrives at its destination safely. Flight attendants constantly encourage passengers to turn off their personal devices or, at the very least, set them to airplane mode. There are also notices almost everywhere informing travelers to follow this guideline.

People used to bring typewriters, video cameras, Gameboys, and walkmans on planes before smart gadgets were introduced. This appears to be one of the older flights that have not yet updated their signs. The caution warns against using outmoded battery-powered products that are no longer widely used.