This is the upgradation of ESP-01 board, had small improvement on PCB.
- 1MB (8Mbit) Flash size.
- Very competitive price
- AP, STA, AP+STA modes available.
- Very simple AT commands, easy to use.
- Internal LWIP interface.
- Four pins interface, VCC-3V3, GND, TXD and RXD. Two extra GPIOs can use.
- AT commands firmware. New IC ESP8266ex