Specifications

Microcontroller (ESP8266)
Core: 32-bit Tensilica L106
Clock Speed: 80 MHz (can be overclocked to 160 MHz)
RAM: 160 KB
Flash Memory: Typically 4MB (varies by model)
EEPROM: Emulated via flash memory
Wireless Connectivity
Wi-Fi: IEEE 802.11 b/g/n (2.4 GHz)
Security: WEP, WPA, WPA2 encryption
Wi-Fi Modes: Station, SoftAP, SoftAP + Station
Operating Voltage: 3.3V
Power Input: 5V via micro USB or Vin pin
Current Consumption: ~70 mA (varies based on Wi-Fi usage)
 I/O & Interfaces
GPIO Pins: 11 (multiplexed with other functions)
ADC (Analog Input): 1 (10-bit, 0–1V range)
PWM Pins: Up to 10
UART: 2 (one for debugging, one for communication)
I2C & SPI: Supported via software implementation
USB-to-Serial Converter (CH340)
Purpose: Allows USB communication for programming
Driver Required: CH340 driver (for Windows, macOS, Linux)
Baud Rate: Up to 115200 bps
Development Support
Programming Languages: C, C++ (Arduino IDE), Lua (NodeMCU firmware), MicroPython
IDE Support: Arduino IDE, PlatformIO, Lua Loader, ESP-IDF
Boot Modes:
Flash Mode (for programming)
Normal Boot Mode (for running)
Dimensions: ~49mm x 26mm
USB Connector: Micro USB
LED Indicators: Power (red), GPIO (blue)

Package include

1xESP8266 Board
1xUSB data Cable