This Weatherproof Telephone Made of Stainless Steel. With the It is very popular for tunnels, mining, marine, underground, metro stations, railway platform, highway side, hotels, parking lots, steel plants, chemical plants, power plants and related heavy duty industrial application, etc. The telephone is suitable for heavy humid environments and can operate in a wet environment for a long time. Its bright telephone color and IP67 high protection level are hard to beat when used as emergency equipment.