Connect this switch to your car battery and remove the knob to completely disable it. Great for repair work and deterring theft. Easily installs onto your battery post with minimal tools Power is disconnected by removing the knob and reconnected by putting it back on Compact size accomodates even the smallest battery compartment Use it on any vehicle occasionally stored for long periods, including RVs and boats, or any valuable car 12 volts, 500 peak/125 continuous amps