The CC1110 and or the CC1111 seems to be the chip that does the RF stuff and there are separate devkits for it, one using the USB dongle and it does mention virtual serial port. I don't know about the link - it works from here (in the USA). the CC1110 devkit page is at: http://focus.ti.com/docs/toolsw/folders/print/cc1110-cc1111dk.html You might want to try googling for the watch and or CC1110