LED Wiring Harness 2 Lead Heavy Duty for LED Light Bar Work Light, 12V 40A Relay, Fuse and On-off switch button included, Life Time Warranty Universal Usage& Length up to 80 inches,It includes an instant On/Off toggle button to provide power to the lights. The Relay will regulate the power to be consistent and also comes with a pre-installed fuse. Power relay-safety protection and conversion circuit. Blade fuse protects the circuit when overcurrent or short circuit occurs. This universal 12v wiring harness is capable of powering up to 40 amps,heavy duty wire gauge makes it more durable What you will also get is KIRA's unbeatable Lifetime Warranty Customer Service.