This wall switch is designed to be durable and resistant against damage from dust. It has IP66 protection rating which means it is dust tight and durable against heavy seas or strong jets of water. It can also withstand very cold and hot temperatures. This makes it great for harsh conditions in commercial applications.\r\nThe grey units are designed for tough environments in industrial, commercial and agricultural uses. The white units are ideal for places that require high sanitation such as the food industry.