A method for processing a transaction. Furthermore, the image device is entirely enclosed into the shield so as to prevent the image device from dust pollution and unexpected damage when the shield is at closing status. A communication system and a relevant device are also disclosed herein. The layout surface having indicia for orienting the discrete timbers in each layer whereby the timber may be roughly assembled. The communication device comprises a radio transmission device which includes a rotary antenna carried by the wheel and a fixed antenna that is carried by the spindle. 30 \u03bcm or less and a centerline average surface roughness Ra of 3.