Network Camera with 2-Way Audio. Includes ceiling mount and 2.3x optical zoom; Use of the built-in microphone and a separately purchased amp-equipped speaker enables two-way voice communication (transceiver system) between the network camera and a PC used to monitor the camera image. In addition to conventional monitoring of images and sound, voice messages can be transmitted from the PC to the network camera. Voice transmission and reception can be switched easily from the PC used to monitor the image.