1. Safe material Made of pure copper, it can be easily used under currents under 4.0 displacement. Memory function, even if the memory relay is not turned on, the relay remains in a conductive state and the original memory state unchanged. Zero power consumption after start. 2. LED voltage display Car battery isolator switch with LED display breaker can detect the battery voltage at any time and display it in real time. 3. Easy installation The power switch uses a negative connection to ensure stable performance. Please remember to turn off the power before installation. 4. Automatically turn off the battery The car isolator switch can turn off automatically or manually. When the battery voltage is below 11.8V, it can automatically turn off the power and thus save power. If the voltage is higher than 13.2V, the remote control is switched off to prevent accidental interference while driving and interrupt the power supply. The power supply can only be controlled via the button on the switch.