This serial cable is designed for use with the Raspberry Pi (RPi), an ultra-low cost, Linux based miniaturized computer. It can also be used as a generic serial cable for any application requires USB to TTL communication Entire USB to TTL(3.3V) protocol is handled by the electronics circuit overmolded in the cable USB terminal. 3 pieces "flying leads" connectors provide GND(Black), TXD(Orange), RXD(Yellow) signals. Data transfer rates from 300 baud to 3 Mbaud at TTL levels.