Not that you expect anything from a product at such a price, but unfortunately they don't work, they only work if you hold them in your hand and turn them towards the sun, and even if there is a lot of sun, anyway even if they worked I don't think they would make a big difference in temperature, the fan is very weak

If there is intense sunlight, the fan works normally. However, if the sun is in a slanted position, the fan does not work at all.