Use UV sunscreen stickers that change color to protect your skin from sun damage. These stickers detect the UV level and remind you when to reapply sunscreen. Stop worrying and enjoy your play time with these valid all day UV detecting stickers.Specifications:Dimensions: 2.4 x 2.4/0.94 x 0.94in per pieceScope of application: suitable for outdoor activities, sports, camping, beach, etc.;Function: Measures the skin's exposure to UV rays and reminds you when to reapply sunscreenFeatures: water resistant, sweat resistantInstructions:1. Apply the patch to an exposed part of the body, such as the arm or face;2. Wait for the patch to change color according to the intensity of sunlight;3. When the patch changes color, it means that the sun protection effect has been weakened and sunscreen needs to be reapplied.Packing list:24 x UV Stickers for Sunscreen