Teensy and RFID? 3.3V?

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CGreen

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I've been using a Teensy 2.0 for several projects and have really enjoyed it. I wanted to play around with RFID so I bought the following RC522 based module. http://www.banggood.com/MIFAIR-RC522-Chip-IC-Card-Induction-Module-RFID-Reader-p-81067.html I didn't really read the specs before I purchased and it runs off 3.3v. Can I just use a 5v-3.3v regulator/buck to power the module and feed the SPI directly? Is the SPI going to be off going from 3.3V to a 5V system and need some conversion? Do I need to get something like this? http://www.ebay.com/itm/331073612421?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 Thanks for any information.
 
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