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Amazon.com: 2X 40 PIN GPIO Header Adapter Color-Coded Header Expansion Board for Raspberry Pi 400,Easy Expansion : Electronics
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40 Pin GPIO Extension Cable for any 2x20 Pin Raspberry Pi [150mm / 6 long] : ID 4823 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Micro Connectors Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board (RAS-GP02),Green : Electronics
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Amazon.com: GeeekPi Micro Connectors Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board 2 x 20-pin Strip Dual Male Header Double Row Straight GPIO Connector Pin Header Compatible with Raspberry Pi(2Pack) : Electronics
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Amazon.com: Waveshare 400 GPIO Header Adapter Compatible with Raspberry Pi with Header Expansion 2X 40PIN Header : Electronics
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Raspberry Pi 400 GPIO Header 40 Pin GPIO Expansion Board for Raspberry Pi 400|Demo Board Accessories| - AliExpress
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Techinal for Raspberry Pi 400 GPIO Header Adapter 1X / 2X 40 PIN Color-Coded Header Expansion Board Easy Expansion - Walmart.com
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