what DC-DC step down step up BUCK converter Made in China actually work? (Quality)

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China Low Price DC-DC 10-60V To 12-90V Boost Converter Step Up Power Supply Module - Quotation - GNS COMPONENTS

Im trying understand the module says max output amps is 2Amps. So it means you can have variety of amps aslong as its under 2A? How do you control to get 1amp

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