Company Information STHLÂ is a high-quality provider of electronics manufacturing services (EMS) locate in in Shenzhen,China. We serve customers worldwide along the whole industry chain including product design, material sourcing, PCBA production, cable assembly, box build assembly and comprehensive testing services. Our 4,000 sqm facilities include 6 surface-mount technology (SMT) production lines, 2 through hole technology (THT) lines , 2 function testing lines and 2 box build production lines.