Zhongshan EEIO Electric Appliance CO., LTD. Is a toroidal transformer manufacturers, the 10 years to focus on custom all kinds of ring transformer products. Products include: 110 vto220v waterproof ring transformer, annular transformer, power transformer, toroidal transformer daily output 5000 units. SAN yuan transformer with more than 3500 companies in the global customers, more than 6300 customized ring transformer. SAN yuan electric appliance is intended to provide the world with more efficient power supply, leaving the world may be more!