We reserve the right to reasonably determine whether a defect in material or workmanship occurred in normal operation or if such damage resulted from a factor excluded from this warranty. Our 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 clients, clients’ employees, or end-user, shall invalidate this warranty. The normal wearing and easily broken parts, include buy not limit, all kinds of filters, belts, electric appliance and wires, bulbs and fuses, glass, rubber and plastics stuffs, etc.