The high temperature inside parked cars can quickly become dangerous, especially for children or pets. You can help prevent this tragedy by providing customers with custom printed automatic alarm car thermometer security cards. This is a low-cost promotional product with many benefits! When the temperature inside the car begins to reach a dangerous level (approximately 87.8 ° F-31 ° C), the black thermochromic dial will disappear and display a warning message. When temps are restored to a safe level for reuse, it will turn back black. The back is printed with temperature information and customized imprints to promote your business and show everyone your level of care for customers, their pets, and children. It is conveniently hung on the rearview mirror and comes with a rubber ring strap