According to the manufacturer, the DYM30911 - Visitor Management Time Expiring Name Badges can be affected by heat if stored improperly. They should be stored at room temperature for proper performance, and extremely cold or hot temperatures should be avoided. These should be stored below 86 degrees F and out of direct sunlight. The are for home or office use, and are not intended for outdoor or exterior use. These badges come with the stop sign printed on them and are used to monitor the visiting time of outside visitors to places such as offices, schools, etc.