I have had an Edwards Adaptabel 430-10NS model for many years. I use it as part of my security system as this bell is very loud (106db) and any intruder who hears the school bell ring and echoes around the neighborhood won't stay here long! Whatever the case, the purpose of the Edwards 349 box is to create a weatherproof case for the bell. After purchasing an Edwards 349 case, I installed the bell on the roof of our house on a pole that carries our weather system's anemometer. When it is there, the "echo effect throughout the area" increases.