Dear buyerBefore placing an order, please make sure that your equipment model is the appropriate model mentioned on the product page. You can check the specific product model on the nameplate at the bottom of the equipment (the names of many sweepers are very similar, so you need to distinguish them by specific model),1. If the package is lost or damaged during transportation, we will refund your money. You should contact us as soon as possible.2. Please contact us before leaving any negative feedback or raising any dispute about express. We will help you solve the problem.3. Please give us a chance to solve any problems. We understand that if the order is wrong, you may not be satisfied, but we will try our best to provide you with satisfactory results.