Question about Brennenstuhl Primera-Line PM 231 E

ok, good to know

The comment that the display does not light up is not wrong. There is no display illumination on this unit. You don't need it. The batteries are not for the display illumination, but for the internal memory in case the power should fail. The back-up batteries do not erase the programming. Otherwise, the unit works perfectly.

Have you followed the instructions for using the product? You will need 3 x LR44/AG13 button cells to get the most out of the product. -> https://static.digitecgalaxus.ch/Files...