* ECC-128/256, RSA Hardware Acceleration Engine for Secure Key Exchange.
* Compatible with breadboards and protoboards.
* On-board CP2104/PIC to flash over USB-A connector.
* User and reset buttons.
* RGB LED to allow more than 7 colour combinations.
* Small form factor (68.78 x 25.80mm).
The Firefly can be seen as the "small brother" of the RE-Mote, with a slick design and a lower cost.
To work out of the box, the firefly includes a PCB antenna for the Sub-1GHz interface, and a ceramic chip antenna for the 2.4GHz radio interface. Optionally 2 x u.Fl connectors for 2.4GHz and sub-1GHz external antennas can be mounted.
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.
The most prominent changes respect to the previous Firefly release are:
* On-board ceramic chip 2.4GHz antenna
* Pin-out changes and CC1200 GPIO2 pin is exposed
* RF matching improvements
* Printed PCB USB A connector instead of Micro-USB connector
Firefly pin-out
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![Firefly Revision A pin-out (front)][firefly-reva-pinout-front]
