The compact and light weight flashlight uses a tiny but powerful bulb to produce UV light, revealing UV ink. When not using it to reveal invisible ink, the device can be used as a regular flashlight or a laser pointer too. Pair HamiltonBuhl's 3-in-1 Light with the HygenX UV Security Marker to invisibly mark and identify your devices, gadgets, AV equipment, laptops, computers, smartphones, tablets, media players, and many other important items.