Manual and remote Control :This disconnect switch can avoid car battery to run out due to long-term parking, line aging and forgetting to turn off the light. It can maximize the storage of car battery power, effectively protecting and extending lifespan. Smart Car disconnect Switch 12V:When battery voltage is below 11.8V, the remote control function will fail ,and the kill switch automatically will cut off power after 120s to save electricity ; when the voltage is higher than 13.5V, the remote control will be disabled to prevent accidental action to shut off the power while driving, it can only be controlled by the manual switch Widely used:This kill switch Suit for most 12V car, boat, rv, trailer, trucks, ATV, UTV, motorcycle, vehicles with displacement less than 4.0; Negative pole: 9-13 mm and 15-17mm, not fit for small pile head vehicles Easy to Install:Battery Cut off switch adopts a negative link method, simple to install and more stable in performance Package include:Cut off Switch x 1 , Remote controller x 2