ELK GROVE VILLAGE, Ill. (November 1, 2017)—Transducers USA, a supplier of audible signal devices, has announced the introduction of its new low frequency piezo audio indicators. These solid-state devices are ideal replacements for electro-mechanical audio devices that include moving parts, which eventually wear out. This innovation represents a new approach to engineering audible signal devices as compared to the use of older electro-mechanical technology.