Experience the efficiency and reliability of the Federal Signal EM3 SelecTone Extension Module, an essential addition to your communication and signaling toolkit. Designed for compatibility with a wide range of devices, this module is perfect for enhancing your business or industrial setup, ensuring clear and effective communication in any workplace environment. The EM3 SelecTone Extension Module is part of a renowned lineup from Federal Signal, a brand synonymous with quality and durability in the realm of signal and communication technology. Its straightforward installation and robust construction make it an indispensable component for professionals in need of a robust and scalable communication system.