Now you don't have to guess when it's time to apply more sunscreen! These smart stickers will alert you when your child needs more protection. They measure UVB rays, changing from yellow to deep orange when sun exposure approaches dangerous levels. Just stick on clothing or skin after applying sunscreen, and watch for the color change. They're shaped like fun sea critters, so kids enjoy wearing them. 18 sensors per pack. Sun Signals UV Sensors- 6.95 at One Step Ahead
