SPI micro SD reader module voltage

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I'd consider that to be one for 5V external logic - as you say, it has a 3.3V regulator, and apparently level converters for the SD signals to 5V.

There are plenty of plain socket adapter modules if you have a device that is already using 3.3V

eg. There are three different versions in this listing that are direct 3.3V modules..

TF to Micro SD Card Expansion Board Mini Memory Module for WeMos D1/ Arduino | eBay

WeMos D1 Micro SD Expansion Board It is easily interfaced as a peripheral to your arduino sensor shield module. Through programming, you can read and write to the SD card using your arduino. SD card to the main board direction MISO signals are also converted into 3.3V, generally Arduino board...
www.ebay.co.uk
 
After some research I have come to the conclusion that you have to power this module at 5V and its data lines are at 3.3V so the can be directly connected to both 5V and 3.3V (Arduino) boards GPIO pins.
 
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