This simple cable has so many uses! Plug the battery clip onto a standard 9V battery and connect the other end to any device that needs 9V. The Connector leads are polarity color coded, Red and Black. Insulates and shields 9 Volt battery snap-on connector contacts Assures safe secure use, reduces the potential of short circuits and prevents tampering with battery contacts Red and black leads. 9V Battery connector is used to hold 9V batteries in one side and on other side wires of connector are plugged in power supply unit to supply power to whole circuit. 9 V Battery Connector for Arduino/Raspberry-Pi/Robotics: Easy to interface power supply. No short circuit. Easy to detect polarity.