Small HDMI media player for continuous operation needed!

Dear Folks!

One of my client has 12 Samsung screens with HDMI input in his store window. He wants to show a unique picture on each screen / 24 hours / every day.
Can anyone recommend me a little HDMI media player (maybe a stick), which plays continuously just one picture without screen saving or automatic shut off?

I need 12 of these, and they should be durable and reliable - and not too expensive. The pictures will be exchanged all 4-6 weeks. So if there is a slot for a usb stick or sd card, this would be an easy operation. I don't want him to connect the boxes via LAN or something else.

Thanks a lot for your help!
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