alzatex RLY15B_GC Flush-Mount 5-Channel Module with Ground Closure Outputs Wesco Superlite which gives you the option

which gives you the option to attach a second mic if desired

or if there is an overload condition

PSC ALMP Line to Mic Level Pad In-Line Barrel Adapter

For Lenses with a 76 to 77

alzatex RLY15B_GC Flush-Mount 5-Channel Module with Ground Closure Outputs Wesco Superlite which gives you the optionThe Alzatex Inc. RLY15B_GC Flush Mount 5 Channel Module features ground closure outputs to operate up to 5 devices or control red yellow green, beeper, and run status with programmable beep tones, and a connector for external speaker (black metal). It fits into double gang electrical box. The Electronic Digital Timer indicator light unit consists of 3 lights, red, yellow, and green. It is designed to be connected to the TimeKeeper series Electronic