An apparatus for generating a random number has high entropy. The housing has a rudder to guide the camera when the camera is disposed in a moving body of water. The channels are configured to move the movable window along the fixed window panel when the movable window assembly is at least partially opened and to move the movable window to a position where the movable window panel is generally coplanar with the fixed window panel when the movable window assembly is closed. A depression member is mounted on the holder plate that presses downwardly on a rod member disposed on the inclined rear face. , arbitrary cooperation among a set of proximate wireless nodes, to be established between devices in a fast and efficient manner. A slider is provided which allows the gap width between the towing vehicle and the trailer being adapted to the respective driving situation during travel.