1. This has a wide range of functions. For example, it can be applied as the switches for the additional equipment inside & outside the vehicle.
2. For load under 3 Amp, you do not need a relay with this switch. For load above 3 Amps, we advise you to use of Automotive Relay (sold in our store).
3. Easy setup. All you need is a 5/8" hole and the switch will sit in nicely.