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This is Arduino Form factor compatible (Not all pins are pin for pin compatible out due to limitations of the ESP8266)
But You can program this via the regular Arduino IDE.. Very interest device for anyone interesting in
prototyping with Arduino form factor shields.
Full information can be found here. Have a read before you buy to make sure this device is suitable for you.
If you are a Maker, an experimenter, a prototyper, I'd highly recommend one.
Before USE D1
You need setup ch340g(USB to UART IC) driver, if you first use it.