Feature:1. Multifunctional: This UV sticker is multifunctional and can be used to see to determine when to reapply sunscreen, the UV detection sticker shows you if you are applying enough sunscreen and when to reapply it.2. Latex Free Adhesive: This sunny patch UV detection sticker is made with a latex free adhesive that will help kids ages 3 and up stay safe in the sun and help prevent sunburns.3. Reusable: This UV detecting patch is reusable, every time you reapply sunscreen, the color change will last all day, every time you reapply sunscreen, and the color change will last all day, very practical.4. Easy To Use: This sunproof UV sticker is small in size and light in weight, which is very convenient to carry and easy to use, you just need to peel it off and stick it to your skin.5. Wide Application: This UV detection sticker has a wide range of applications, which can be used for home daily commuting, traveling, beach, camping, hiking, and so on, very practical.Specification:Item Type: UV Sunproof PatchMaterial: PVC, Color Changing PaperSpecification: Single Patch Diameter: Approx. 1.5cm / 0.59in, Color Changing Area Siameter: Approx. 1cm / 0.39in, 108 PatchesDisposable: Non Disposable, ReusableColor Display After UV Exposure: Purple.Package List:108 x UV Sunproof Patches3 x ManualsNote:1. The product is transparent without exposure to ultraviolet light, the sticker changes to purple after ultraviolet light exposure, and the sticker becomes darker purple with stronger ultraviolet light. 2. Ultraviolet light exists in both winter and summer.