The ESP8266 WiFi Shield for Arduino is an Arduino compatible shield for the ESP8266 WiFi SoC – a leading platform for Internet of Things (IoT) or WiFi-related projects.
Features:
Integrated TR switch, balun, LNA, power amplifier and matching network
Integrated PLLs, regulators, DCXO and power management units
Integrated low power 32-bit CPU could be used as application processor