|ESP-01 WiFi module (with ESP8266 IC)|
A small WiFi module with an ESP8266 IC and onboard antenna. Communication is via an 8-pin (4x2) header. See the article "A WiFi Server for $5" in the December 2014 issue.
Please note: if you order this item, you may receive an upgraded ESP-01S which has more flash (1MB vs 512KB).