This handy cut-off switch lets you quickly and easily disconnect your battery for safety when... see moreThis handy cut-off switch lets you quickly and easily disconnect your battery for safety when servicing your vehicle or in storage, to eliminate battery drain while vehicle is not in use, and for security as an anti-theft device. Install on the negative post of your battery, attach battery cable to the switch and you're done! To engage power close the lever (made of quality solid copper). To disconnect power open the lever.