If you want to use a very small battery powered camera/recorder for very long time, then use this converter.
It converts 12V to 3,7V.
For example, you have a pen with a hidden camera and recorder.
Just open it and solder 2 wires there where the battery is placed.
Remove the battery and you can record very long time.
There is also a converter from 12V to 5V, very easy if you want to use a 5V camera in your car.
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