New technology allows you to easily detect UV leaks in your A/C system. 50 Watt flashlight features 90° swivel head with variable focus beam. Instant on battery operation. Operates 20 hours on 2 AA batteries (not included). Works with all common fluorescent dyes. Patented UV emitter bulb has 25,000 hour life. Magnetic base. Includes safety/enhancing glasses. U.S.A.