Auto alert. The black disk clears away and reveals a warning message when heat in vehicle is potentially dangerous for children or pets. Imprint on back. Not available less than minimum. NHTSF: Even outside temperatures in the 60's can cause a car temperature to rise well above 110 degrees Fahrenheit. Size: 3" W x 5 1/2" H x 16 pt. card stock. Material: 16 pt. card stock.