These LED flashlights which emit ultraviolet light at a wavelength of 385nm (slightly higher than standard 365nm "woods" lamps).
Each flashlight is fashioned with a patented professional grade filter to block white (visible) light completely (even from the LED's), which otherwise would make it difficult to see fluorescent reactions.
Push button on/off switch. Includes 3 AAA batteries and a convenient nylon belt holder.
NOTE: Insert batteries in the bottom of the handle. Do NOT unscrew the head of the flashlight. The head contains fragile wires that could easily become disconnected, breaking the flashlight.