The basic idea of the device is good. As well as already described in other reviews, to install the batteries is tricky, because the housing is cheaply made and not fit, so that the batteries terminals. In addition, the batteries had first no contact, I could fix with a small screwdriver. Sprinkle is only possible if one can easily shake off the spreader and the settings on maximum setting (speed distribution plate and passage grit). The four batteries held exactly three and a half minutes, then the distribution disc was slow.
