The outdoor weatherproof telephone housing is constructed of high-impact, anti-corrosive polyester material. GAI-Tronics' Intrinsically-Safe Telephones are the safest and most economical communication solution in hazardous environments. The Intrinsically-Safe Telephone is for use in chemical plants, refineries, grain elevators and any other environment where volatile gases and dust are a major consideration. Consists of models 272-001 (Intrinsically Safe Telephone - Outdoor) and 263-000 (Isolation Barrier)