A 40-pin male-to-male wire usually refers to a dupont jumper wire ribbon cable that has 40 individual wires joined together in a flat ribbon. Each wire has a male pin (header) on both ends, so you can connect boards, modules, and breadboards directly.

Key Details:

• Pin count: 40 wires side by side (you can peel them apart if needed).

• Connector type: Male-to-Male (pin on both ends).

• Pitch: 2.54mm (standard for breadboards, Arduino, Raspberry Pi, ESP32, etc.).

• Length : 22cm

• Colors: Usually multicolored ribbon (helps identify connections), sometimes black only.

• Use cases:

  • Connecting Arduino/ESP/Raspberry Pi GPIO pins to breadboards

  • Linking modules and sensors

  • Prototyping and testing circuits