MinChen 502B UV Flashlight, 1 Mode 395-410nm UV-Ultraviolet Led Flashlight with 2pc Protected 18650 Battery and a Wall Charger, UV Ultraviolet LED Flashlight Torch with Features Money Detector Compared with 365 uv light( invisible), the 395-410nm uv light is visible, the Black Light makes those fluorescent substances shine brightly, great for Identified Money, Passport Detection, Textiles Checking, automotive and industrial fluid leaks detection; cracks in antique porcelain/glassware Detecting, night fishing ice lure finding, easy to find carpet stains ,bed bugs, pet urine in the black light, and scorpions catching and so on. Works best in dark environment. The UV Flashlight only needs 1pc 18650 3.7v battery, the Ultraviolet LED Flashlight Kit comes with 2pcs 18650 Rechargeable Batteries and a smart charger, each batterys really capacity is 2000mAh, 2pcs totally 4000aAh for the black light, no need to buy batteries separately, long lasting and rechargeable. 1-Mode 100lumens, Tail-cap Press ON/OFF switch, simple and convenient to use