Features: Ultra Bright UV LED Keychain Flashlight: The UV keychain LED flashlight offers 12 lumens handy close-up UV LED light, it can be the easiest nearby emergency UV light to get. 395nm UV light black light can work perfectly well for detecting urine and bodily fluids in the dark. 395nm UV black light is also used for checking identification cards, credit cards, cash, stamps, etc. Tiny and Lightweight and Safe UV LED Keychain Light: The size of the UV keychain LED flashlight is like a quarter, it's only 0.25OZ weight. It's very convenient to attach to the keychain, dog collar, zipper, backpack, hiking or camping devices and so on. It's very convenient for you to carry with it everywhere, have the UV keychain light, have the safety with you. Two Easy Use Methods: (A)Instant Key Light: Slightly pinch the middle of the UV keychain flashlights with your two fingers to activate instant UV light; (B)Continuous Light: Slide the On/Off Switch to turn on or turn off the mini UV light keychain flashlight. Replaceable CR2016 Batteries: The mini UV keychain flashlight is installed 2 x CR2016 batteries. When the power of the batteries are running out, you can replace the CR2016 batteries yourself. Great Gifts for Lighting Effect: 100 PCS UV key ring flashlights are included in the package. They are also perfect for night party, Christmas, Halloween, and outdoor activities. Specification : Light Source Type: LED Light Color: UV Output Luminous: Flux 12 lumens Mode: 1 Mode/Single Mode, (On/Off) Battery Configuration: 2 X CR2016 Batteries (batteries are included) Flashlight Shell Color: Black Size(Length*Width*Height): 1.61" x 0.91" x 0.28"/4cm x 2.3cm x 0.7 cm Material: Hard Plastic Weight: 0.25OZ/7g Package include : 100 X UV light keychain flashlight-Black Shell 1 X User manual