2 in 1 Inspection light (16 LED + 8 UV LED) Cordless with hang hook and magnetic hold on the back. This a dual purpose unit that doubles as a very bright regular cordless Inspection light and a UV inspection light. For use both in dark space attics and crawl spaces and also to detect leaks in refrigeration systems etc. Every plumbing/HVAC contractor needs one, but most don't buy one since they are usually too expensive. UV light, combined with fluorescent tracers, are used by Plumbing/HVAC contractors in a closed, fluid or gas based system to detect cracks and leaks in pipes, valves and filters. Fluorescent tracers are used in combination with high intensity UV-light to detect leaks. Contractors in the HVAC trade use this ultraviolet black light to detect leaks in refrigerant gas in Industrial applications, homes and automotive systems. Cordless Emergency lights are big and cumbersome and Leak detection equipment of this kind usually costs in the hundreds of dollars and most contractors do not own them. With this inexpensive and effective product leak detection is available to the regular contractor on the job. This mini monster Cordless Emergency Light/Inspection light now has one of the brightest lenses available for the size that it is. This Flashlight works off of 3 AA batteries that will last months since LED's don't burn a lot of juice.