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Accessories fail quietly. A lead that carries a picture at 1080p but not at 4K120, a charger that halves its output the moment a second device is plugged in, an adapter that converts a signal one way but not the other - every one of those looks like a fault in the expensive hardware it is attached to.
The specifications below are the ones separating a cable that works from one that almost does. Each is printed on the product page; the difficulty is knowing which number to read.