1. It has a wide range of functions. For example， it can be applied as the switches for the additional electronical equipment inside&outside the car. (such as flashing lights， chassis lights， and dome lights)2. For load under 3 Amp， you do not need a relay with this switch. For load above 3 Amps， we advice you to use of Automotive Relay.3. Easy setup. All you need is a 5/8" hole and the switch will sit in nicely.4. LED on all the time or only when switch is on(depending how you wire it)Features:Material: metalHole size required 16mm 5/8"Depth inc contacts 35mmLamp type:two LED light(Symbol&Angel Eye LED)LED voltage: 12V onlyContact Configuration: 1NO 1NCOperation Type:LatchingLatching type: push it—on(off)， push it again -- off (on)Package Include:1 X Green LED Push Switch