The WAVES Integrated Speaker Unit (ISU-8121), part of the ALERiTY mass notification platform, is a high-efficiency audible device that delivers high-quality, crisp voice announcements. It can be used for both indoor and outdoor applications and is generally installed to provide coverage in areas where obstructions may block a High Power Speaker Array (HPSA), for example in between buildings. It can also be used in interior buildings that have higher levels of ambient noise such as industrial buildings. The ISU-8121 is a tightly integrated unit so that it can be installed easily and rapidly.