【SMART SUN MONITORING】Designed for busy parents and outdoor enthusiasts during sunny beach outings, these skin-friendly and safe patches monitor sun exposure. Apply them directly on your skin to see when your protection fades. 【REAPPLY WITH EASE】Never guess your next application time again. These make it easy to know when to reapply your sunblock, ensuring constant defense for the whole family during those long park picnics. 【GENTLE ON SKIN】Featuring a skin-friendly and safe adhesive, these patches of 9 cm / 3.54" sheet size stay comfortable all day. Ideal for sensitive individuals during hot summer camp trips or outdoor sports. 【VISUAL REMINDER SYSTEM】The color-changing responds directly to sunlight strength. With 2 sheets included in your pack, you can easily manage daily outdoor skincare routines during extended hiking trips or pool sessions. 【OUTDOOR ACTIVITY ESSENTIAL】This sunscreen is very suitable for children and sports enthusiasts when playing in the fierce football match or backyard. It can instantly show the best time to apply sunscreen, so you don't have to worry about the sun. Package list: 2x UV test stickers