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If you accidentally program this as a 5V/16Mhz board, you will lose access to the USB port, this is recoverable, but can be tricky. This is the 3.3V / 8Mhz version, supplied with unsoldered header pins.
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.