Attention please: It’s important to know that 365nm UV light is not visible when you're shining it on non-reactive surface. If it looks dim, that's a good thing. NOT RECOMMEND to use this 5W 365nm UV torch for detecting cat dog stains urine as bright 395nm black light. 365nm Ultraviolet LED light is invisible to the naked eye. But it’s perfect for detecting of high demand like fluorescent agents & security code. Please clear your needs before ordering. If you want maximum effect from "black light" reactive items, 365nm is the best wavelength for this. Ultra-low "visible" light emission shines at a wavelength of 365nm- ensures the stain, not the surface, is illuminated. The 365nm light will appear white on neutral non fluorescent surfaces, where as the 395nm will appear purple. This flashlight produces a near pure UV output which is the optimum frequency for UV fluorescence. The human eye can perceive light between the range of 400nm and 700nm. 400nm light is perceived as the color violet. The ultraviolet spectrum resides below 400nm. In the case of 395nm light, some of the light will bleed into the visible spectrum, thereby producing a violet glow. 365nm is well beyond the visible spectrum, so it can produce clearer florescence, cleaner more vivid colors, and no violet glow. 395nm is less expensive and can work perfectly well for detecting urine and bodily fluids in the dark, but for document verification, counterfeit detection, photography, and other specialty applications 365nm is a much better choice. Specifications: Item: 365nm UV flashlight torch Light source: 5W 365nm UV LED Dimension: 9cm (h) x 2.5cm (d) Battery type: 1 x AA battery or 1x 14500 rechargeable battery. (Not included battery) Body materials: Aluminum alloy Focus adjustable: Yes Package includes: 1x Portable small 365nm UV black light