As a professional transformer manufacturer, Wanji was founded in 1987 and merged by Zhuoao in 2022, is located in Hangzhou Bay New District, Ningbo. It is a professional manufacturer of intelligent controller (PCBA) and power transformer products. The company has won the honorary titles of "National high-tech Enterprise", "National Little giant" firms (specialized and sophisticated enterprises that produce new and unique products) and so on. In 2021, was listed on the NEEQ Concept Stock (securities abbreviation: Zuoao Technology, stock code: 872337).

The company has two production plants, controller division and power division, covering an area of 40,000 square meters, and currently has more than 500 employees. Under ISO9001 and ISO14001 system, the company implements ERP and MES management, and all materials meet RoHS requirements. Our products carry UL/cUL, CE, RoHS, CQC, CSA, ETL, TUV, GS etc. approvals, Power Supply Dept has 12 Toriodal Transformer Production Lines, monthly productivity of 80,000, 10 EI Transformer Production Lines, monthly productivity of 220,000; PCBA Dept has 5 SMT production lines, 8 AI production lines, ICT, FCT, AOI and other automatic testing equipments, with an annual production capacity of 8 millions sets of PCBA.