3 Pin Electro-Mechanic Flasher - 3 pin electro-mechanical 12 volt flasher will last up to 10 times longer than thermal flashers. Able to handle variable loads - can flash up to 10 signaling lamps and 2 indicator lamps. Flash rate will not slow down when towing a trailer. Meets FMSVSS108-S.A.E. J590b J945. Precious metal contacts. Unique audible click. Input lead must be fused at 25 amps.