The 5MP DHD50/28RW-T-M turret style camera can achieve up 50m IR distance, much more than standard eyeball domes. It comes with a built-in microphone so can utilise the audio over co-ax feature.
Audio over co-ax allows the camera to transmit audio picked up from its built-in microphone and transmit this over the came co-ax cable as the video transmission. An audio over co-ax compatible recorder is required to fully utilise this function and would allow audio on each channel an audio over co-ax camera is on.
