Teensy 3.1 XBee Adapter connect a XBee and Teensy together, it also acts as a breakout board for both. Each pin on the Teensy and XBee has been broken out to standard 0.1″ spaced through-hole soldering points that allow you to connect any additional parts that you would like to incorporate with the adapter. Though the adapter design interfaces best with the Teensy 3.1, the Teensy LC can be utilized as well. Paired with the XBee you can get a great long distance serial connection, and with the 72MHz of processing speed (48MHz for the Teensy-LC) you can do a lot with the information.
Resources
Schematic
Eagle Files
Hookup Guide
GitHub