Shanghai Dingyuan Science & Tech Co., Ltd was located in International city, Shanghai, specialized in producing, sales, Technology surpport, products research & development and after sales service.We have a strong research and development, management talent team. What&＃039;s more , we cooperate with a lot of colleagues and research institution, under the excellent research talent and strictly manage, now we own the most advanced technology. Now we main produce and sell video surveillance series products, power transformers, voltage stabilizator, reactor, voltage regulator and other electrical series products. Our target; --- go after better quality to serve old and new customer, to get more reputation Our promise; ---Do our best to satisfy all our customer, never give up.