Battery Doctor Battery Disconnect Stop-K Master Switch. Key is removable in OFF position. At 12-volt: 1,000 Amp surge, 100 Amp continuous. At 24-volt: 500-amp surge, 50 Amp continuous. With extra key, waterproof cap. 3-1/2 inch x 2-1/4 inch x 2-1/4 inch Ideal for marine use!. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.