katito UV LED Light Flashlight Keychain ID Currency Passports Detector (Purple) Made of durable ABS plastic with 4 screws for battery access (not cheap snap together) Ideal for your portable carry-on tool or for your friends gift Used for verifying ID card, currency, credit cards, checking freon leaks Button has 2 settings: 1-always on. 2-press and hold to turn on. Each LED keychain flashlight powered by 2 x CR2016 button cell batteries (included)