hese window intercom systems, often called security intercoms or talk-through intercoms, are designed to provide communication through a barrier, such as a ticket window. They are widely used in theaters, sports venues, race tracks, and concert venues. Other common uses include payment windows, government agencies, police departments, and correctional facilities. The ICW-6 supports both gooseneck ( MCP90-12" or MCP90-18") and microphone (PH-88-IC3) to accommodate virtually any operational requirement. This system requires either a gooseneck or headset (SOLD SEPERATELY) For use in windows with a hole size between 2.6" - 4". Installation is quick and easy with the supplied templates. Weatherproof and virtually indestructible, these systems greatly improve the transaction between the customer and the agent. Clear communications eliminate errors and frustration. Choose a headset over a gooseneck mic for added clarity and greatly decreased office noise level