This is a portable, easy to use 9UV LED LW Light. It makes an excellent tool for the office or a quick field inspection. It is lightweight and small enough to fit into a pocket. A nylon strap is attached for easy handling and it operates on 3 AAA batteries (included). The wave length of this light is 400-405nm, while this is not as effective as a higher dollar light it works great for out in the field testing.  A perfect way to quickly view your fluorescent mineral collection.