I purchased a 4 in 1, 1500 w welding machine with the Raycus source. The product works very well and the team answers every question I have. They helped me to put it into operation and when I had a problem, they helped me very quickly. I recommend this company. I keep in touch with Jim Luo, he is a man of his word and I love working with him. I will also purchase the following equipment from them.