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The USB transceiver inside the 32U4 incorporates USB connectivity on-board and does away with a bulky external USB interface. Running at 16MHz and 5V, this board will remind you of your other favorite Arduino-compatible boards, but this little guy can be integrated into designs where others just won't fit, with the simplicity of an integrated Micro USB connector.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.