The protector's variator circuit protects the highly sensitive electronic components of modern motorcycles against destructive voltage which can occur, for example, when the battery is being charged while it is installed or when jump starting. Particularly recommended for motorcycles with ABS, fuel injection, electronic ignition, etc. It is simply screwed on to the poles of the battery. An inexpensive but extremely sensible safety feature for your motorcycle. Can render expensive repairs unnecessary and extend the service life of the bulbs.