... 300 works in Shenzhen, China. Main products are USB converter cables: usb to RS232, USB UART TTL 3.3v level and USB ... , USB RS422 cables, USB Parallel cables, USB to Audio cable. The chips are availavble for PL2303, CP2102, FT232RL, ZT213. SP485, MAX3232, ... by CE, RoHS, CCC Siforcon means Sincere for connecting. We will be keeping Sincere for customers and contnuous developing on connecting cables ...