Our UV Detection Sticker contain Nano Glue, Soy Ink, Pet Film. It can use cutting-edge UV protection technology to ensure that you are protected from harmful rays. Its use is simple: keep the skin dry, apply the patch to the skin, take appropriate sun protection measures by looking at the color of the patch to determine the current UV intensity, and guarantee a better outdoor experience. It can provide real-time monitoring, and the patch turns purple to remind you when to reapply sunscreen.