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. Practical light: mainly used for detecting or verifying any fluorescent liquid, such as pet urine, , currency, driver's license, ID card, passport, etc. Portable design: Conveniently connect the torch to the keychain using a detachable keyring and carry it with you.