Looking for an alarm clock

So far I've been using an old smartphone but the snooze function is unreliable, i.e. it stops at some point and there's no way to just slap it to make it snooze.

So that is one very important feature.

It also must have an option to be completely dark, preferably slap it to light the clock for a few seconds.

And a choice of soft/rising alarm tones or preferably even upload own audio files.

And not constantly connected to a power outlet.

That's very specific but I'm willing to spend some money on it. It doesn't necessarily have to be manufactured in Europe, but that's where I will order it.