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This board makes connecting wires to the Raspberry Pi GPIO incredibly easy. It's a reference board that makes it really easy to see if you're connecting your wires correctly. Adafruit liked the Pi GPIO Reference Board from Low Voltage Labs so much that they worked with Low Voltage Labs to license their design! Adafruit made some changes to the Low Voltage version - including grouping the pins into categories like I2C, IO, UART, SPI, and power.

 

It's only 0.8 mm thick, idiot proof (you can't put it on backwards...), and makes a great key chain for the Pi enthusiast. Simply slide it onto the 2x20 GPIO header, then you can plug in premium jumper wires with female sockets on top.

 

This version works with the Raspberry Pi Model B+ / Pi 2 / Pi 3.  It does not work with the Raspberry Pi Model B but they do have a B version as well!