Practical light: mainly used for detecting or verifying any fluorescent liquid, such as pet urine, , currency, driver's license, ID card, passport, etc. Reliable light source: Each mini UV flashlight comes with a small LED bulb, providing 10 brightness levels and a lifespan of 100000 hours. Enough to meet your typical needs. 2 lighting methods: the button briefly to activate the instant light, and sliding the switch backwards activate continuous lighting to release the hand. Battery operation: Powered by two built-in CR2016 button batteries. They can each be removed for replacement and endure 12 hours of continuous use. Portable design: 1.6 inch L x 0.87inch W, weighing 0.2 ounces. Conveniently connect the torch to the keychain using a detachable keyring and carry it with you. Colour: Material:plastic Package Contents: 100 x keychain light 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.