An engine includes a throttle, a drive shaft, a driven shaft, a continuously variable transmission coupling the drive and driven shafts and providing a mechanical advantage therebetween, and a governor that operates the throttle as a function of rotational speed of the driven shaft. The second radiating element has opposite feeding and grounding end portions, each of which is coupled to a respective one of feeding and grounding end portions of the first radiating element. The main LED is electrically connected in series to the output terminal of the rectifier unit and the input port of the primary-side circuit of the switching mode power supply.