The UV LED Flashlight is designed for curing UV resins and sealants, whether it be for tying flies or repairing waders. The nine LED's emit a light with a wavelength of 385 - 400 nm. The push button on the rear of the light makes for easy on/off operation. The UV LED Flashlight is powered by three AAA batteries (not included). The UV LED Flashlight is also great for charging glow lures and jigs.