Ningbo Zhongtong Electrical Appliance Co., Ltd ƙwararre ce a cikin relays, masu haɗawa da kayan doki. An kafa shi a cikin 2010 kuma ya himmatu ga bincike, haɓakawa da kera na'urorin lantarki na kera motoci, sabbin na'urorin lantarki na makamashi, da kayan aikin waya, masu haɗawa.