The Godlyke Reverse Polarity Jumper Cable (included in the PA-9 Power-All System, available separately) allows you to power effect units that have reverse polarity barrel connectors (tip positive/barrel negative). Can be hooked to any jack on the 5-Connector daisy chain or directly to the PA-9 itself. See recommended accessories for PA-9 Power-All System and 5-Connector Daisy Chain (which is included in the PA-9 system).