JEGS LED Turn Signal Flashers are required for use with LED tail lights & turn signals. LED turn signals use much less power than standard incandescent bulbs and won't work correctly with a standard flasher. Choose from 2-terminal or 3-terminal style flashers to match your existing vehicle wiring. The 2-terminal LED flasher comes with a polarity reverser that may be needed in some applications. These flashers are for use with 12V electrical systems, and are designed to regulate no-flashing or fast flashing issues when converting to LED lights.