The listing comes with the opportunity of returning your defective core amplifier for a $100 refund.

Core refund process:

We provide a return shipping label in the box with the unit that you have purchased.

You return your old/defective core in the same packaging using the enclosed return shipping label.

We process a refund to your transaction method within 3 business days of receipt and you'll be notified via eBay that a refund has been processed.

Most units qualify for the full refund amount, though major liquid and physical damage can lower the refund amount.