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Amazon.com: 40Pin GPIO Cable Adapter+Raspberry Pi 2/3 Model B Multifunctional Cascade Expansion Extension GPIO Board Module for Orange Pi PC : Electronics
File:Cjam-raspberry-pi-2-model-b-gpio-pins.png - Wikimedia Commons
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![Raspberry Pi [R2] + Extension Board V2.1 Pinout – howto8165](https://howto8165.files.wordpress.com/2014/08/rpi-pinout.png "Raspberry Pi [R2] + Extension Board V2.1 Pinout – howto8165")