Designed for simplicity, these UV test patches are easy to use. Simply attach them to your desired surface, and watch as they change color under UV exposure. Their lightweight and portable nature make them a must-have for travelers, outdoor enthusiasts, and anyone looking to monitor UV intensity effortlessly. Features -Color:Transparent -Material:Self-adhesive sticker -Size:10.00X5.20X0.10cm/3.93X2.04X0.04in -Note:8pcs/sheet -Uv intensity tracking: monitors uv levels in realtime, aiding in the planning of outdoor activities to prevent overexposure - change: the sticker's photosensitive material changes color quickly under uv light, indicating sunscreen performance -Lightweight and comfortable: designed to be thin and suitable for all skin types, it integrates easily with daily makeup and sunscreen - for outdoors: for beach trips, hiking, and cycling, providing essential data for effective sun protection -Practical choice: a great option for those committed to living Package list: 20 x Sheets of Uv Sensing Stickers