Durable battery isolator and simple operation: cut off and turn off the battery by pressing the On/Off button. -Effective in solving these problems: leakage current and loss of electricity, and battery life is extended. -Quick battery cut-off switch, ideal for preserving battery charge over time. 4 main switches of battery for wiring in the positive end.Be careful that only the battery is cut off, not the whole ignition system. 5.The key can be removed if there is no has no electrical connection.