Freezer alarm

I don’t trust even having an Alarm I put a heavy object ontop so the door can’t open
Thank you all for you responses and help.

My freezer is at my shop so my biggest concern was someone unplugging it to use the outlet and forgeting to plug it back in. So I have the plug ziptied to the outlet and a sticker on the cord stating “Do not unplug”.

But it just died a week ago it seems.
 
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