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Universal DC 5.5×2.1mm female interface, compatible with various power modules and devices, convenient for power connection and circuit testing. One end comes with a male DC plug, and the other end is equipped with a crocodile clip, which can quickly clamp wires or terminals to improve testing efficiency. Using high-quality copper core wires, with stable conductivity and reduced current loss, suitable for precision experiments and equipment debugging. The crocodile clip color zone has black polarity to prevent wiring errors and ensure safe and reliable connections. The wire length is moderate, with a total length of about 30cm, soft and resistant to bending, widely used in LED lights, monitoring equipment, laboratory testing, and DIY circuit projects.