I expected the chip inside the Portronics Flash C2 to contradict its own box. The box says “Thunderbolt 4.0,” and I a**umed the tiny e-marker in its USB-C plug would admit to something slower. Instead, my M2 MacBook Air read it with a Samsung T7 Shield on the far end and a free app called WhatCable, and the chip agreed: USB4, 40Gbps, 240W.