Ac Dc Power Adapter Manufacturers & Suppliers in China - OUSM Power Adapter Manufacturer - Find high-quality power adapters from a trusted manufacturer? Oushangmei Technology Co., Ltd. is a professional ac dc power adapter manufacturer based in China with over 12 years of experience in the industry. Specializing in the production of high-quality power adapter and power supply, It's a top power solution factory in Shenzhen, OUSM is the best choices of your ac adapter supplier & wholesaler.