High-performance, anti-static, thermoplastic material resistant to chemicals and solvents. Set screw helps to avoid batteries being changed out, or the housing inadvertently being opened in a hazardous environment. Combination of visual and mechanical polarity protection ensures correct installation of batteries. Sealed switch design protects it from corrosion caused by battery leakage. Lightly textured parabolic reflector produces a smooth, uniform beam with optimum peripheral illumination. Regulated run time provides consistent performance throughout battery life. Larger size makes the 3C ProPolymer HAZ-LO ideally suited for situations where gloves are typically worn. O-ring sealed, dust-proof, water-tight enclosure. IP67 rated for dust-tight and waterproof to one meter for 30 minutes. IPX4 for water spray.