This module is designed for use in emergency evacuation systems and is powered by an external 24V DC source. It accepts a line level audio input and produces a 100V line output via a transformer. It also features short circuit, overload and thermal cutout protection, and is constructed on a steel chassis. Designed with reliability and robust performance in mind, it is the ideal audio power source for evacuation systems, or any application which requires a DC powered 100V line amplifier.