Behind each individual button is an LCD screen. This means that you can digitally change your icon, and access menus through the buttons. From live-amperage readings, to button action setup, everything you need is easily accessible without the need of downloading an app. Whether you want your accessory to work with or without the ignition on, simple push ON/push OFF or one of the many other functional features, You can quickly and easily set the function for each output. The beauty of running an electronic solid state system. is your output location (the slot you wire your accessories) doesn't determine the button location. You can choose button 1 to control output 3, or 4, even both! The possibilities are endless.