Item Type: Flashlights Product: UV LED Light With Key Chain Material: Metal Power: 4*LR41 button battery (Include) Color: Black, Red, Blue, Purple, Green, Silver Size: 4.6*1cm Total Length: 9.5cm Package Included: 1PC UV LED Light With Key Chain Feature: You can detect money with the UV LED light Powered by button cells (included) Comes with a keychain so you can put it with your keys and take it anywhere you like Perfect for your portable carry-on tool or for your friends gift High-power illuminating lamp beads, which can be used to check the authenticity of banknotes and detect fluorescent agents Metal key ring, sturdy and durable, not easy to fall off Function: LED counterfeit light LED small flashlight Counterfeit detector Glasses anti-radiation UV optometry Note: 1.Please allow 0.1-0.3 cm differences due to manual measurement, thanks. 2.Please understand because of the light irradiation or computer display difference, so I can't guarantee photos and real color is 100% the same.