The VB-C50i offers audio capability when the optional VB-EX50 Multi-Terminal Module is added. With the module a microphone can be connected to the camera, allowing remote monitoring of audio at the camera site. Admin Viewer or Viewer for PC and a speaker-equipped PC allows you to hear audio with the captured video images. Audio playback also lets the remote user or a pre-recorded audio file be heard at the monitored location through a powered speaker. Playback can also be linked to motion or sensor triggered events.