This small longwave (365 nm), 4 Watts battery operated UV lamp will fit in your pocket, or easily into a crime scene kit. It measures only 6 1/4” x 2 1/8” wide and 3/4” thick. Operates on 4 AA lakaline batteries (not included). Rugged thermo plastic lamp housing will provide years of dependable service. Ideal for scanning all types of physical evidence, including use to detect counterfeit bills.