We reserve the right to reasonably determine whether a defect in material or workmanship occurred in normal use or if such defect resulted from a factor excluded from this warranty. This warranty does not include defects from normal wear and tear, accidents, negligence, abuse, shipment, handling, storage, or environmental conditions. Any modifications to our products by the client, client's employees, or end-user, shall invalidate this warranty. The normal wearing and easily broken parts, include but not limit, all kinds of filters, belts, electric appliance and wires, bulbs and fuses, glass, rubber and plastics stuffs etc.