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. Light designed to not power on if batteries are installed incorrectly. Sealed switch design protects it from corrosion caused by battery leakage. Smooth parabolic reflector produces a tight beam with optimum peripheral illumination. Regulated run time provides consistent performance throughout battery life. 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.