The Model 490S-120T strobe light is UL listed for use in Class I & II,Division 2 hazardous locations. These units have a Lexan lens and base, polyurethane potted power supplies and are suitable for outdoor use in NEMA 4 locations They may be operated in any position and feature a 1/2" pipe mount. UL Listed for Class I, div 2 Groups A, B, C, & D. Class II, div 2, Groups F & G.