Q1. Who are we? We are manufacturer with an independant R&D office in Shenzhen, China, we have worked in HVAC filed for more than20-year, we provide OEM ODM service to meet with customer unique requirement, we have 1-plant and 3-office in Shenzhen , Dongguan and Suzhou, there are total about 150 people in our company.Q2. How can you guarantee quality? We provide 3-year long warranty for our product from shipping date. And all time life free charge upgraded service.Q3. Can I order a sample for testing and checking quality? Yes, for the first order,we welcome sample order to test and check the quality.Q4. What about your leading time? Stock items, we can send immediately. Mass production time is about 20-40 days according to your order quantity.Q5. Why should you buy from us not from other suppliers? Over 13 years of EMS manufacurer, we have three senior engineer has worked in HVAC filed for more than 20-year, All the products are origin design and development ,we have applied related design and invention patents . All the products are personal tooling product .so that they have rich practical experience. Honestly, not big company, but we are accumulating small innovation from client feedback all the time. Dedicated to be reliable brand, we can grow together.Q6. What services can we provide? 1. Before sale technical consultant service 2. In sale ,technical supports 3. 24-hour online technical supports after sales service 4. Online technical trainning 5. Custom design hardware and software development Q7. What is the payment method you support? Alibaba trade assurance, PayPal, Western Union, Bank T/T, Credit card etc.