THG Set of 2 Universal 12V Auto Battery Storage Link Terminal Quick Cut-off Isolator Disconnect Master Kill Shut Switch Brand new battery master disconnect kill switch and starter immobilizer for cars and trucks with Top Post batteries Easily cut off switch enables you to quickly and easily disconnect your automobile battery for safety, servicing, or storage To engage power just hand tighten the green knob, Slightly loosen the green knob to disconnect all power The green knob can also be completely removed to help discourage unauthorized use They are recommended by classic car insurance companies and required by many auto storage companies