The Fortune BL-A7 portable black light includes a 4-watt bulb, emits lengthy-wave ultraviolet light at 365 nanometers, and may be used to identify invisible ink, authenticate paper currency, look for pet stains, search for manufacturing defects, find insects, or perform similar tasks. The attached strap could be looped around a hands or wrist for transporting. This black light measures 6.5″ lengthy and 1.6″ wide, and needs 4AA batteries (offered individually). Fortune Products manufactures battery-operated lighting products for special occasions, periodic decor, and interior planning. The organization, founded in 1985, is headquartered in Lake Stevens, WA.