LED Daytime Running Light DRL Relay Harness Automatic On Off Control Headlamp Side Light Controller 16W Automotive Assembly Come with safety fuse with the anode wire. Great add on item for controlling headlamp, DRL or side lights. Allow you to connect your DRL lights so that when you start the car the lights turn on And then when you turn you headlights on the DRL will turn off! Complies with EU regulations as the DRL are designed for daytime use only.