The firefly includes a PCB antenna for the Sub-1GHz interface, as well as 2 x u.Fl connectors for 2.4GHz and sub-1GHz external antennas.
The firefly can be programmed and debugged over JTAG and USB. The board has a CP2104 USB to serial converter with a PIC, it allows to program the CC2538 without having to manually to put the device in bootloader mode.
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