I bought one from Amazon and it never turned on. I contacted the seller to see how and where the wires are connected to since about half the wires were disconnected and the circuit board fell out of the box it sets in. The seller, Tuxing, immediately got in touch with me. I was communicating with people at the factory in China! Yes, I was impressed too. They wanted me to contact them using the WhatsApp. It was here that we were in contact. They were really eager to help me get my compressor to work. They sent me videos and photo's of where to hook up the wires. The main issue was the wire's on my machine were different then the wiring they showed me. They even sent me a new circuit board from China. Which impressed me more. In the end the unit never worked. They initiated a return and the return label had ME pay for the shipping charges with amounted to $168.25! I shipped it to their repair center in NY. I contacted Amazon asking for a reimbursement for the shipping costs. They were flabbergasted that I did not receive a postage paid return label. The Chinese wanted to repair it and send it back to me. I wanted either a new one or a refund. I did not want that one anymore. They refunded the shipping via PayPal and processed they refund. I haven't received the refund as of yet. So the take away is that Tuxings customer service is very very good.