These are very adjustable DC/DC boost converters! The lower limit of 10 volts is definitely accurate as you MUST be above 10 volts for an adjustment to work. When the input voltage is below 10 volts, the output is equal to the input. As soon as the input voltage exceeds the level you set, the output follows the input again. So if you want to limit the output level, just add a zener diode with any voltage limit. Great price for what you get, of course they are made in China.
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