An arm head of a windshield wiper device is provided on a backside thereof with an undulated groove formed by sidewalls. According to the present invention, it is possible to objectively discriminate an organic farmland from a conventional farmland or discriminate an organic crop from a conventional crop. The assembly further comprises a plurality of connecting pins for bone fusion. The lens is free to move relative to the reflector plate and is capable of being raised or lowered by the encapsulant that wets and adheres to it and is placed at an optimal distance from the LED chip.