The Pure Resonance Audio RMA240BT is lightweight and features a slim, space-saving design that allows it to only take up 1 rack unit. This amplifier solution includes a 4-16Ω/70V distributed audio speaker output, 2 AUX inputs, 4 MIC inputs, and 1 emergency channel input. In the event of an emergency, you can quickly use the emergency input to stop all other audio transmissions. This emergency input takes priority letting any integrated emergency voice alarm system be heard loud and clear. The overload level light indicators on the front of the unit provide valuable short circuit, overload, and overheating protection by alerting you to potential issues.