This I/O cable assembly allows you to connects peripheral devices like remote triggers, shutters, and filter wheels to your SPOT Pursuit or Xplorer camera. Some Pursuit and Xplorer cameras have three SMC connectors that individually control the TTL Out, Ext. Trig Ready, and Ext. Trig. Input. The EXTCABLE has a SMC connector on one end for attachment to the camera, and a BNC connector on the other end for attachment to an external device.