The REVERE Power Master™ RPD2 Alert Pak is a Micro 2 Tone Surface Mount Piezo Sounder. Smaller than a pack of regular cigarettes, it is perfect for discrete applications. It features a dB rating of 100 at 10 ft. It has a "Quiet Touch" feature designed to lower the dB level where desirable. It is ideally suited for alarm signaling indoors and also outdoors in weather protected areas such as soffits, eaves, etc