EVO Formance LED Bullet Strobes are the only headlight strobes that require no installation. Plug and play design allows you to simply replace any existing # 194 (T10) bulb with a Bullet Strobe and you’re done. There are no wires, no transformers, and no controllers. Each Bullet Strobe is completely self-contained and programmed to emit a powerful "triple-flash" strobe pattern. Each one uses an overpowered, high intensity 1 Watt LED. Turn the strobe on and off with existing vehicle parking light switch. As with all CIPA products, they are high quality. Don’t Change… Evolve