UUGear Zero2Go Omini, User Manual

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The board size of Zero2Go is exactly the same with Raspberry Pi Zero, and can be
mounted on Raspberry Pi Zero without soldering (thanks to the pogo pin connector).
You can also mount Zero2Go on other Raspberry Pi models that have 40-pin header,
if you solder a female header on Zero2Go as well (not included in the package).
How Zero2Go works? The diagram below gives you the main idea.
If the input voltage is higher than 5.5V, then the DC-DC converter will be used,
otherwise the input voltage will pass through to output. The e-Latching Switch will
maintain the power if system is up and the button on Zero2Go is not tapped or hold.
Since DC-DC converter needs more dropout to work well, inputting 5.5~7.0V should
be avoided when possible.
DC-DC
Step Down
Reversed
Polarity
Protection
e-Latching
Switch
Voltage
Comparator
Pass-through
Output
5V
Input
5~26V