Replacement:WRL-10268. The latest revision of this board breaks out the PIO4 pin and has a minor effect on the PCB size. This page is for reference only. The BlueSMiRF is the latest Bluetooth****wireless serial cable replacement from SparkFun Electronics! These modems work as a serial (RX/TX) pipe. Any serial stream from 9600 to 115200bps can be passed seamlessly from your computer to your target.