This Kit allows a "do-it-yourselfer" to build your own custom switch and LED accessory for SwitchGlo Pro. The Push-Button is a secondary glow trigger while on the ground and the LED is for visual confirmation that your glow-plug is infact glowing. Highly recommended for the Scale-Modeler who wants an On-Board Glow Indicator while in flight, but also keep the most realistic look without having unnecessary cut-outs in the body of the aircraft. Now you have the freedom to mount an extra LED and Pushbutton anywhere on your craft.