This is a breakout board for the RN-131g WiFly GSX module, an ultra-low power 802.11b/g transceiver. This board breaks out all pins of the RN-131g to two 17-pin 0.1" pitch headers. Board comes fully assembled and tested as pictured. 1.2x1.8" (headers are separated by 1.1") Project description, more information and ordering can be found at https://www.sparkfun.com/products/9333 Datasheet: http://www.sparkfun.com/datasheets/Wireless/WiFi/rn-131-ds.pdf Reference Guide: http://www.sparkfun.com/datasheets/Wireless/WiFi/WiFlyGSX-um2.pdf WiFly Troubleshooting: http://forum.sparkfun.com/viewtopic.php?f=32&t=25129