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The Bluetooth XBee USB Adapter FT232RL for Arduino + Micro USB Cable is a compact USB with serial adapter equipped with BEE (20pin 2.0mm) sockets. With integrated FT232RL IC, It can be used for programming or communicate with the board which basic Arduino but without USB interface, like Sniffer Nano.
On the other hand, you may connect your PC to various wireless applications via the BEE compatible modules. The Adapter also could support the XBee interface.