Federal Signal PMC-012-024R PLC. Is multifunctional combination audible/visual signal engineered for panel mounting. Pmca offers three levels of alarm, controllable via independent electric contacts and three channels including flashing only, flashing and intermittent sound and steady light and continuous sound. The panel mount line offers a self a self-extinguishing PC body that protects against vibrations, dust and atmospheric elements. They are panel mounted through a 1.18 inch hole and secured with a the provided locking ring.