For easy identification, each wire in the Qwiic Cable is color-coded. The colors red, black, blue, and yellow are used, making it simple to recognize and connect the wires correctly.
The SparkFun Qwiic connect system, which this cable is a part of, is a comprehensive ecosystem of I2C sensors, actuators, shields, and cables. This system is designed to make prototyping faster and less prone to error. All components within the Qwiic system use a common 1mm pitch, 4-pin JST connector. This not only reduces the amount of required PCB space but also ensures polarized connections, eliminating the chance of incorrect hookups.
For more details, please refer to the dimensional drawing and Fritzing part documents. You can also visit the Qwiic Landing Page for more information about the Qwiic system.