The Deltabell LED and Strobe with Backlight Dummy with White Cover is an economical and effective alarm for your property. This aesthetically pleasing sounder offers a number of engineer friendly features including the unique leveling mechanism and modular components for simple installation. Hinged cover locks into place so that both hands are free to work on the sounder. 109 dBA sounder. Piezo sounder with high decibel output. Low voltage strobe. The strobe emits a low voltage as it comprises of LED bulbs Easy to fit with a built in spirit level. The Deltabell E has front and rear tamper protection and in the event of a potential sabotage attack, the 109bBA sounder provides a distinctive audible warning.