Works great with push button switch. 110 ****+SUPER LOUD*******

The Federal Signal Model D (originally produced by Federal Electric) is a vintage, 8-port electromechanical siren. Designed for indoor industrial use and short-range outdoor warnings, it features a small 1/2 HP motor and peaks at roughly 112 dB at 10 feet. The unit utilizes swivel mounts on a metal stand for easy aiming.Because Federal eventually phased out the Model D to streamline their lineup, surviving working units are now sought-after collectibles.