For the newer (and cheaper!) version of this product, see RS232toTTLv3.
This is a level shifter for connecting the serial port of a computer to a TTL micro controller or any other TTL UART device. The pin spacing is standard 0.100" and will accept a four pin header so that it can be plugged directly into a breadboard. The pinout is labeled on the board and is Vcc, TX, RX, and GnD.
This device uses the MAX 3221 from TI.
