This HP toner supply is warranted to be free from defects in materials and workmanship. This warranty ds not apply to toner supplies that (a) have been refilled or tampered with in any way or (b) experience problems resulting from misuse, improper storage, or operation outside of the published environmental specifications for the printer product. To obtain warranty service, please return the product to your authorized HP service provider or place of purchase. At HP's option, HP will either replace products that prove to be defective or refund the purchase price. This warranty is superseded by any service contract under which this product was purchased.