This product is made from high-quality aluminum alloy, which makes it durable, lightweight, and scratch-resistant, rusty-proof, shock-proof. 9 UV LED allows it to cover a larger area without weaken the light. You can use it to detect counterfeit money, cash, bill or to discover food stains, bedbugs, scorpions and pet urine stains on carpets and so on. The product don't contain batteries, pls prepare 3pcs AAA Standard batteries yourself. It's compact and portable can fit in anyone’s pocket, shirt, and pants or attach it to a keychain. Perfect for events such as trade shows, promotion, sales visits, conservation and so on. 3 3/10''L x 1'' DIAM