The e-Q2B electric siren includes a 200W Class D audio amplifier for increased reliability and external diagnostics to monitor power, output voltage, and current monitoring. Features include park kill input, which immediately shuts off the siren when the vehicle is in the park, and electric horn ring input, which allows the user to cycle through siren tones. The e-Q2B also has an audio output that works with the Federal Signal Rumbler Traffic Clearing System.