A wireless communication system and method includes providing at least one master unit and a plurality of slave units communicating with the at least one master unit over at least one wireless communication link. The amplifier amplifies each channel reflected in the gratings. The optical member supporters each support the optical member and are mutually spaced apart from each other to effectively dissipate heat and reduce the weight of the LCD. The detonation products are accelerated in a low-pressure or vacuum chamber and discharged through a nozzle into contact with a substrate situated in low pressure to produce a high quality coating.