I bought the product this week. Unfortunately, I can't switch it on. I've had it plugged in for a few hours, but the display doesn't show anything, even when I press the reset button. Does anyone know why it doesn't work?

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I have tried it on several sockets. 
At first, when I unpacked it, I could still see something on the display, but the next day there was nothing on the display.

Answer

Most likely a problem with the internal battery. See if there is anything about the battery in the instructions. The thing should work as soon as you plug it into the socket.
To be on the safe side, does the socket have power?

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Question about Steffen Time switch

I bought the product this week. Unfortunately, I can't switch it on. I've had it plugged in for a few hours, but the display doesn't show anything, even when I press the reset button. Does anyone know why it doesn't work?