Shenzhen Yiyan Circuit Technology Co., Ltd. Is a leading enterprise with 20 years experiences specializing in PCB R&D and manufacture with certifications of ISO9001, ISO14001, IATF16949, ISO27001, CQC, UL, RoHS, REACH etc. Shenzhen Yiyan have 2 manufacturing bases which locate in South China (Humen factory) and Central China (Jiangxi factory), covering area of 180, 000m2 with monthly production capacity of 280, 000m2. Our products covering 1-24 layers Rigid PCB, flex PCB, Rigid-flex PCB, HDI, High frequency, metal PCB etc which are widely applied in security & defense, industrial control, communication, medical instrument, automotive electronics etc.