This is an RC switch that plugs into your receiver and can be triggered by your transmitter in flight. Once triggered it will set off one of the electric fuses, which will in turn light a smoker (fuses & Smokers not included).
It is suggested that a seperate small 9v PP3(only 2v needed to light fuse) or AAA cell battery be used as the power source to ignite the fuse - so please consider this extra weight when thinking about using this setup.