Stability testing of ESP-12E
As the smallest low-cost system for learning, can develop AT command or SDK download
Reference links: https://github.com/esp8266/Arduino
http://www.xess.com/blog/esp8266-reflash/
Full IO interfaceleads, supports AT and internal ESP8266 to direct product development

Technical Details

Size (LWH): 3.6 inches, 2.5 inches, 0.6 inches
Product Details
Product Dimensions: 3.6 x 2.5 x 0.6 inches
Shipping Weight: 0.02 pounds (View shipping rates and policies)
ASIN : B012W1LEL8