The PCB layout has changed for an improvement in WiFi radio performance
1MB Flash Memory...upgraded from 512KB
Latest version esp-01s,with stronger signal
Document link: https://nurdspace.nl/ESP8266, video link video link:https://youtu.be/mS2kQVD5Sxw
What You Get: 2 X ESP8266-01S Module. Our 1 Year Warranty and Friendly Customer Service.

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 2 inch
Height : 0.5 inch
Length : 3 inch

Item Weight: 0.16 ounce (View shipping rates and policies)
Shipping Weight: 0.64 ounce (View shipping rates and policies)

ASIN : B016U051MK