Combination Battery and Alternator Kill Switch is designed to completely shut down the battery and charging system in an emergency situation. Designed to work with 12V systems and 120 Amp alternators. Ideal for racing, vehicle storage, marine, or RV applications. The main and auxiliary contacts are both controlled by the red knob. To operate, simply twist the switch knob clockwise to turn the switch on and push to turn it off. Easily mounts onto flat surfaces and panels.Ideal for racing, vehicle storage, marine and RV applicationPrevents battery drain, theft, and reduces the risk of electrical fire.PushOff for emergency shut-down and color-coded to indicate operating position- ON or OFF, with a durable spring-loaded designMeets IHRA, NHRA and SCCA sanctioning body requirements