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WiFi at 2.4 GHz, supporting WPA/WPA2 security modes. The peripheral circuits use the CH340G serial port chip, which is stable and easy to debug. Simply connect it to a computer using a micro USB cable to download and debug programs, and use dedicated software to burn firmware.
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.