Shenzhen Only-First Technology Co., Ltd. produces switching power supplies, adaptors, car chargers, high & low frequency transformers,and kinds of inductors and magnetic components. Our products of self-research & designed have been certified by major safety certifications, like CB, UL/CUL, CSA, FCC, TUV/GS, CE, CCC, SAA, PSE, C-Tick, B Mark, and K Mark. We insist on the tenet of Quality, Efficiency, and Customer by scientific management methods and practical business philosophy to offer you quality products at competitive prices, at the first time.