Based on the ESP-8266EX.
Arduino Compatible, you can use it on Arduino IDE.
11 Digital I/O pins 1 Analog Input pin, Insert pictures: description-01, 02,03
Support OTA wireless uploading
What You Get: 1 X D1 R2 Wifi UNO. Out 1 Year Warranty and Friendly Customer Service.

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 3 inch
Height : 0.6 inch
Length : 4.6 inch

Item Weight: 0.8 ounce (View shipping rates and policies)
Shipping Weight: 0.8 ounce (View shipping rates and policies)

ASIN : B016PNJ40W