In short, while it is a little bit larger than some of the other XBee serial to USB converters on the market I think that this is the best one out there. It comes with a cable to help interface this circuit with a computer which is fantastic! The only problem that I had with this adapter is that I haven't been able to get it to work with OTG USB cables. However, if you are using the cable that comes with it, this is not a problem.
