This is an easy-to-use, retractable car shade that blocks the sun and features a White Hot® patented heat alert system that turns white when the car is too hot.The Brica White Hot® Sunsahde keeps baby's skin and eyes shielded from the sun's glare. With a patented White Hot® system to let you know when it's too hot in the car, it's the best and smartest window shade on the street!This baby sun shade has an easy 2-step release button - just push and release to adjust, or push and hold to roll up.