1The 12V battery switch is very suitable for yachts, cars, trains, boats, caravans, RVs, trailers, winch power cords and so on with higher tolerance. 2The switch can be used in 12 V to 50 V Dc systems for isolation and protection of electrical systems. When not in use, safely disconnect the battery to eliminate battery consumption. 3Easy to install, can be used independently or locked together with other switches to isolate and protect the electrical system of the 12V to 50V system. 4This control knob has an interchangeable labeling system that allows a full range of applications; the back cover insulated rear terminals to prevent any short circuits. 5Switch to the counterclockwise 45 degree position to remove the control knob. The engine must be stopped to protect the alternator before selecting shutdown.