Ai Thinker NodeMCU-ESP8266 is an open-source firmware and development kit that helps you to prototype or build IoT products. It includes firmware that runs on the ESP8266 Wi-Fi SoC from Espressif Systems, and hardware which is based on the ESP-12 module. The firmware uses the Lua scripting language. It is based on the eLua project and built on the Espressif Non-OS SDK for ESP8266.

Features:

1. WIFI module: ESP-12S
2. Processor: ESP8266
3. CP2102 Chip
4. Built-in Flash: 32Mbit
5. Antenna: Onboard PCB antenna
6. Peripheral interface: UART/SPI/I2C/SDIO/GPIO/ADC/PWM
7. WiFi protocol: IEEE 802.11 b/g/n
8. Frequency range: 2.4G ~ 2.5G (2400M ~ 2483.5M)
9. WIFI mode: Station / SoftAP / SoftAP+Station
10. Power supply: 5V
11. Logic level: 3.3V