There is no warranty of the RF transistor. We guarantee the all transistor products that we sell are original and can work normally. In addition we do not accept return or exchange of RF transistors. After this component leaves our warehouse, this component is not refundable. Please be careful before ordering transitor. Make sure you book correctly because exchange and refund will not be allowed. This policy update is done in response to customer incidents that order the wrong components or replace our transistors with transistors from other sources. We have no authority to resolve this issue and we can not resell these items as new items after these transistors leave our warehouse.