1. Any question are welcomed if you have any doubts for products and services, We will be very glad to respond to you promptly.2. We provide 1-year warranty for our products. For any quality problem, we can send FREE spare parts to resolve. Matching failure or unexpected damage shall not be our responsibility. Goods can’t be returned once sold. Actually, to avoid any quality problem, we have tested EVERY piece of our products before shipping, and goods are well packed. 3. For customer with annual order quantity above 20 thousand pieces, we can send technicians to customer once/twice a year to provide on-site after-sale service, such as technical guidance and boards fixing, etc. this service is FREE of Charge.4. For credit regular customer, we accept O/A payment terms.5. As a growing company, we want to grow and share with our customers. Let us know what we can do for you.