SODIAL(R) USB to RS232/TTL PL2303HX Cable Adapter COM Module Converter Adapter for Arduino USB TO RS232 TTL PL2303HX Auto Converter Module Adapter 5V Output, provides the best and convenient way to connect your RS232 TTL devices or DEMO BRD. To your computer, via the usb port. Specification: Built-in TTL COM PC-PL2303HX Chip Standard USB type A male and TTL 4 pin connector Cable length: 1000mm (39 3/8 in)