One of the greatest symptoms of corona 19 is fever, and 37.5 C is the reference point The color of the sticker attached to the body changes when the body temperature reaches 37.5 degrees * 10 stickers / one pack * Certification : FDA, ROHS * Real-time high fever check * Large number of people simultaneously checking for fever * Simultaneous Bulk Distribution Possible * Low price * Easy and fast primary measurement * Excellent adhesion (sweat, shower, etc.) - Recommended: rub the sticker attachment area lightly in the shower. * A sticker that is harmless to the skin (using approved adhesive on the FDA & ROHS) * Waterproof (not spoil by water) * Semi-permanent use as long as it does not fall off the human body * Recommended place of use (Government offices, Hospitals, Big marts, Restaurants, Concert halls, Religious facilities, Schools, kindergartens, Companies, Armies, Home: kids & old peoples who need intensive care)