Methods, computer readable medium, and apparatus for tracking the direction of a moving item by laser bar code scanners are disclosed. The integrated mail gateway is programmed to create an e-mail message comprising the voice message. The switches are arranged between the shorting bars and the bonding pads. The computing system further includes a controller module. The light detecting element includes a terminal resistance unit that is provided between an amplification unit and an output port to limit an electric current of the output signal.