FT232RL USB B to serial adaptor module, ideal for interfacing a USB to a microcontroller serial RS232.  USB power can be set to either 3.3 or 5vdc with an onboard link.  Uses a clone FT232RL chip that is fully supported by most computer operating systems. Please Note: that there are reports that the latest FTDI drivers are not suitable and only the older driver version 2.10 works.

Module size including header, 31mm long, 15.9mm wide, 7.5mm high

Please refer to the FTDI FT232RL Driver webpage for more infomation including the software.