All our healthcare products are warranted for one year (except the consumbable products) against any quality defect. Kejian will repair or replace (replace with same part or equivalent in case of original part is a discontinued item) any defective part during this period. The shipping cost to us is not covered under this warranty. After completion of warranty repairs Kejian will send back the product to you at no cost. This warranty does not cover abuse, improper installation, improper connections misuse, neglect,accident or abnormal conditions of operation. improper maintenance. Warranty voids if any attempt to tamper with the product as evidenced by disruption of warranty sticker and/or unauthorized repair/modification of the product.