2.1mm barrel plug (5.5mm outer diameter). Short barrel to barrel cable for daisy-chaining Row Powers and/or Pods. Cable is 8" long, suitable for connection two adjacent Modular Rows that are directly connected or separated by a 30 or 45 degree angle piece. Also suitable for two Pods directly connected to each other.
Connecting a Row Power and a Pod will typically be more convenient with the Long Barrel Cable, though either one will work.