State-of-the-art design: super compact 365nm pen. Adjustable zoom UV light that easily illuminate a larger area or narrow to a special point. High quality LED head and special design polycarbonate lens that reduces light loss. Highest quality: 100,000 hours of UV LED head life. Shock and scratch resistant polycarbonate lens. T6061 aeronautical aluminum machined CNC resistant body. Type II hard anodized, corrosion resistance in all outdoor conditions.It works with 2 AAA batteries (not included).