This is a useful cable to connect to a power source, like a battery to power your project. This cable has 5.5 x 2.1 mm DC barrel jack (female) on one end and the other end is two alligator clips, red for positive lead and black for negative lead. The 5.5 x 2.1 mm DC barrel plug is commonly used and the alligator clips can be connected and disconnected easily when needed.
