Have you actually used the Amazon $50 devices? It would not be the first time that the claims made in the description were sharply undercut by the actual produc

Have you actually used the Amazon $50 devices? It would not be the first time that the claims made in the description were sharply undercut by the actual product. I’d easily believe that a tight BOM lets you put something roughly watch-sized together but that it involves enough compromises that few people would consider it a true competitor.