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This set includes 5 pieces breadboard power supply module, specially designed for MB102 102 prototype breadboard. It provides precise 3.3V and 5V dual voltage output to power various electronic circuits and DIY projects. The module supports two power input options: DC 6.5-12V external power or USB power supply for flexible usage. Built with safety protection function, it ensures stable voltage output and avoids circuit damage. Easy to install and use, ideal for electronic teaching, circuit testing, Arduino projects and daily prototype experimentation.