Sample Q:what is the delivery time of the sample? A: 1-3 days with our neutral packaging. Q: how do you deliver samples? A: through express. In order to avoid any damage, we prefer federal / DHL/TNT/UPS. OEM/ODM: Q;Do you accept OEM & ODM service? A: Yes,we accept OEM & ODM,as well as a professional team for customer ODM service. Mass production: Q: what is MOQ? A: we also accept a small number of first trial orders. Q: what is the delivery time of the 1000 computers? Answer: General requirements for 15 days, special materials or processes for more than 30 days. special materials include ceramic / Wood / glass / bamboo / metal. Quality Control: Q: how do you control quality? Answer: according to the ISO2001:2015 version quality management system, the scientific and rigorous laboratory is allocated. Strict IQC standards before assembly, and then we have seven QC steps to ensure quality: airtightness testing / functional testing / QA testing / aging testing / visual testing / field repair / weighing. Guarantee: Q: what is the warranty period? Answer: 12 months. Q: what is your general failure rate? Answer: below 0.3%. Q: how to deal with sales after breakage? Answer: You just need to tell us the number of broken diffusers and we will send you the perfect product for the next repeat order for free. If you can't wait too long or you may break up with our partner, no problem, we'll be perfect for you separately, and we'll pay the freight.