Reveal Hidden Secrets: Utilize the 395nm UV light to detect hidden stains, fluorescent materials, and more. Perfect for pet stain detection, document verification, and beyond. Compact & : these mini UV keychain flashlights are designed for ultimate portability. Easily attach them to your keychain, zipper, or backpack for instant illumination wherever you go. User-Friendly Operation: Activate the light effortlessly with a simple slide switch. No complicated procedures, just instant UV illumination at your fingertips. Long-Lasting Power: Each flashlight is powered by CR1220 batteries(With battery), providing up to 18 hours of continuous use. Versatile Gift Idea: Enhance safety, create fun party atmospheres, or brighten outdoor adventures with this set of 144 UV keychain flashlights. Ideal for night events, holidays, camping, and emergencies. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour: Material:Plastic Package Contents: 144x mini UV keychain flashlights Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.