This is a nice little set of chargers. (USB and Cigarette 12v charger, on/off switch, and volt meter) The volt meter is pretty close to the shunt .01 off, so its close enough for my usecase. Quality is average, it is not bad, but it is not superior/best on the market. I will likely work well in most installations. If you plan to use it around water, you will want some type of seal around it because this did not come with any.