The item arrived quickly. The appearance is slightly different from the ones I had before. The ones I have (which arrived earlier as part of the modules) are marked "XLSEMI", and the described microcircuits - "XLSEML". For verification, I assembled a model from a datasheet on one of the received microcircuits. Input - 12 V, output - 5 V. Load currents - 0.37 A, 1.65 A, 2.11 A. The heating of the microcircuit for these test conditions is insignificant. Conversion frequency - 188 kHz, voltage at pin 2 - 1.24 V. The results satisfied me. I recommend the seller, the product - with the proviso that I have not tested it for maximum current.