1 Channel Stereo True Bypass Looper. Left and Right Sends and Returns of the effects loop are able to be true bypassed to maintain your stereo signal path. L/Mono Input will split the signal out to both Left and Right Sends when nothing is plugged into the Right Input. L/Mono Ouput will sum Left and Right Return signals when is plugged into the Right Output. Green LED indicator lets you know when the effects loop is active.