A MEMS microphone package device includes a MEMS microphone chip as an integrated circuit chip. If a header portion includes no broadcasting destination, a normal mail transmission process is performed. The network device also includes a packet format module that adds a header to the aggregate data to form a unicast packet. The scanning device is configured to be disposed in a first path of the ion beam toward the end station and out of a second path of the ion beam toward the end station. The sunshade also includes guide wires and support wires for properly guiding and supporting the flexible shade during retracting and extending.