4 Pack Battery Master Disconnect Kill Isolator Switch Terminal Quick Immobolizer WirthCo Battery Doctor Top Mount Compact Battery Switch Without Fused Bypass Is Easy To Install On A Negative Battery Post. The Battery Is Disconnected By Unscrewing The Knob A Few Turns; And Can Be Reconnected By Tightening The Knob The Knob Can Be Removed Completely To Deter Theft Compact Size Fits Most Battery Compartments The Switch Is Rated 500 Amperes Surge And 125 Amperes Continuous At 12 Volts Includes 4 Battery Disconnect Switches