Ultra-bright Wearable flashing LED reflector. Super versatile! Wear on shorts/waistband, hydration belt, pack/bag strap, shirt sleeve/collar, vest, caps/hats and more. Brilliant LEDs! Add high brilliance reflectivity to just about anything! Ultrabright flashing LED Simple press button on-and-off Drugstore battery for easy replacement Battery included / ready for use Easy to attach with integrated dual magnet Available in two shapes and three fluorescent colors Less than 1/2 ounce, Vizlet LED adds feather-light reflectivity/brilliant fun!