All parts are tested and guaranteed to be working as described. We guarantee that you will be pleased with the item or you can return the item for your money back within 30 days. In the rare case where the item is defective you may return it for an exchange. If you prefer a refund for any reason during the 30 days, simply return the item, it will be tested, and if found in the same condition it was received in, your refund will be sent. Please note there is a 15% restock fee and the actual cost of shipping is not refundable.