They are marked 'Nano' but are actually Pro Mini which means they won't work if you don't select the correct board when uploading. Thanks to the other reviewers. here who discovered it and posted it here. Only tried one out of five so far which didn't work at all until I installed the IDE on the Pro Mini. Now it works fine but what a headache to fix. Probably would have returned it if other people hadn't posted the tip here.
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