A device or system for producing acoustical signals that continuously vary in frequency and call for the right-of-way of an emergency vehicle.”SAE defines an Electronic Siren System as a combination of a siren amplifier and speaker(s).electronic sirens are powered by amplifiers and oscillators. Electronic sirens often feature a PA system with a handheld microphone, radio rebroadcast functionality, volume control, and a built-in control panel. Electronic sirens are also incredibly compact, so they can easily be installed inside your emergency vehicle. They're heavy-duty and incredibly durable, so they're perfect for exterior mounting. They also deliver a high-level sound with a rich tone that is ideal for a fire apparatus or ambulance. Contact us here if you have any questions about our high quality and affordable led lights.