The pump works effectively when the sun shines. However, the smallest shadow is sufficient to interrupt the spectacle (a cloud, or a person who passes the solar cell). But this is for devices which are operated directly from sunlight, probably to be expected. In the pack also different top sections are included in addition to the solar cell and the pump, which can be used to change the behavior of the injection pump. The only shortcoming I evaluate the very almost guessed instructions (which does not deserve the name). For example, the question is open as to whether the pump is because winterized. I'll have to ask the manufacturer. Nevertheless 5 stars. The price is definitely great.
