Designed for single-channel, two-way indoor and outdoor communication applications, our Hazardous Location Wall-Mount Intercoms are rated for Class I, Division 2, Groups A, B, C, & D; Class II, Division 2, Groups F & G; and Class III. Features include integrated volume control, Talk/Listen switch, corrosion resistant cast aluminum housing with rugged powder coat finish (Type 4X, IP65 enclosure), reliable 25-watt speaker and balanced line output. These heavy duty units are UL and cUL Listed, CSA Certified and Marine rated and are designed for multi-voltage operation (12VDC, 120 or 240VAC).• Heavy duty industrial intercom for indoor or outdoor applications • Single channel, two-way communications • Integrated volume control and Talk/Listen switch • Call Button • Balanced line output • 25 watt speaker • Cast aluminum housing with rugged powder coat fnish • Multi-voltage operation: 24VDC, 120VAC and 240VAC