This is a switch which is activated by pressing a key. After a preset time (max. 15 minutes) the button snaps back and the circuit is interrupted. The desired time can be adjusted by removing the key cap and a screwdriver. There is no scale or other indications of the set time. Per experiment you can try if the time interval fits. If necessary, correct several times. That's not quite comfortable. Then: cap it - done. From other manufacturers (eg. B. Busch-Jäger) I know timer that can be adjusted to the desired time (such as a kitchen timer) using the rotary control. As you can see at first glance how much time you have set, and how long the connected electrical appliance is still running. This is absolutely not the case. Therefore only 3 stars. Technically, the part properly.
