A wireless optical communication system can reduce the power consumption needed for light emission by a controlled node and suppress a modulated signal component, other than the modulated signal of input data for transmission, in the modulated signal components carried by the light output of the controlled node. The device comprises at least two electrodes and means for dissipating heat from at least one part of at least one of said electrodes. The reduction gear unit includes a geared speed reducing section having a small gear rotated by the actuator and a large gear provided in the proximal side end link member. The adhesion is improved with increasing levels of multiolefin content in the butyl rubber ionomer. The guides define a plurality of guide channels that receive the articles.