1UV DETECTION STICKERS: These UV stickers serve as a convenient way to detect your sunscreen by indicating whether you have applied enough sunscreen and when it's time to reapply, ensuring optimal UV proof throughout the day. 2GENTLE ADHESIVE: Designed without latex adhesive, these SPF stickers are safe for children aged 3 and above to use in the sun, helping to prevent sunburn and promote sun safety during outdoor activities. 3COLOR CHANGING INDICATOR: When exposed to UV rays, the stickers transition from transparent to purple, with the shade of purple changing based on the strength of UV exposure. As the color deepens, it signals a reminder to reapply sunscreen. 4REUSABLE STICKERS: These UV detection stickers are reusable, allowing for continuous monitoring of sunscreen application. Each time you reapply sunscreen, the color changing feature lasts throughout the day, providing ongoing feedback on UV exposure. 5EFFECTIVE UV INDOCATOR: With their innovative design and practical usage, these UV detection stickers are a reliable tool for enhancing sunproof awareness, making sunproof simple and straightforward for individuals of all ages.