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If you take for experiments, then you need to take several at once. Because fastidious modules on power, work with them strictly on datasheet, one has already burned, and the levels there are not even ttl, take from the same seller level converters. One of the modules got faulty. Have does not match the stickers, all modules have the same sticker. There is a suspicion that modules are some kind of rejection or own diy of our friends. But in general, it works...