The product has previously bought a thing for 12 V, this time it is the second time. I think that the function as an intermittent wiper is reasonable and good. Even if the genuine switch is broken, it will be intermittent upgrade if attached. Intermittent without interruption for 2 to 30 seconds is convenient. However, attention is necessary because installation does not go like a pounding if it is not detailed about electricity and maintenance a little.