Add On DRL Daytime Running Light Relay Harness Auto Car Control On/Off Switch 12V 16W Head Light Side Lamp Controller 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.