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Fits 15.5–17mm negative battery terminals. Direct mount on negative top post, no extra cables or hardware required for installation, quick wiring without complex tools. Anti-corrosion solid brass terminals with insulated plastic housing, superb electrical conductivity. High continuous current rating, stable power control with zero overheating & minimal voltage drop. Twist knob on/off operation for fast power cut-off. Clear printed 'OFF' marking plus colour-coded dial: red for power isolation, green for active power, simple visual operation. Full power isolation when switched off, prevents parasitic drain and deep battery discharge for cars, boats & campers. Shuts drain from accessories/defective wiring to extend battery lifespan. Works with all 12V–24V electrical systems: Car, Marine Vessel, Boat, RV, Camper, Caravan, Truck, ATV, UTV & battery banks. Essential safety accessory for vehicle and marine users.