Super power blacklight glows a deep purple and brilliantly lights blacklight posters, invisible ultraviolet inks, some currencies, certain minerals, etc. Unit is complete with a sophisticated circuit board and was designed for use by a cosmetic company for use in detecting skin problems. High quality completely assembled unit is about 7" long x 3" wide x 2-1/4" deep. It uses a 12VDC 500ma adapter (included) and its circuitry allows the unit to be turned on for one minute then it resets after another minute. The circuitry could possibly be modified for continuous on, however, we don't have any information on how to do this. We will tell you that the output of this is very bright and covers all of the longwave spectrum. Brand new in manufacturer's box. Very unique and worth many, many times our price.