I don't get to drive one of my cars very often, and I know the battery will drain if I don't disconnect it. With this Battery Terminal Quick Disconnect, all I have to do is just unscrew the green knob until the brass contacts are separated, and the frustrations of a dead battery are over! Using the 15-amp Bypass Fuse allows enough electricity to flow to preserve radio station presets and for a vehicle's clock to keep time.