| Brand | Unbranded |
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Check the listing for details. 5.5mm/2.1mm DC Barrel Polarity Reversing Cable. Condition: New. Listed at 7.45 USD. Usage is simple: plug into any 2.1mm/5.5mm DC plug (or jack!)., and what was center-negative will magically swap to center-positive. Now, your guitar pedals, label printers, etc, will be able to use the common DC power adapters you have on hand.