The Blazer FL550 thermal 3-terminal flasher fits all standard round sockets and produces 60-120 flashes per minute. The heavy-duty variable load flasher complies with US FMVSS 108 SAE J945, J950 standards and compatible with 11 - 15V systems. The flasher controls 2 - 3 lamps for turn signal and 2 - 6 lamps for hazard warning signal.