Specification: _x005f_x000D_ Color: black, blue (optional) _x005f_x000D_ Working voltage: 5V supports USB power supply and provides USB debugging interface _x005f_x000D_ Product size: about 47 * 30 * 10mm/1.85 * 1.18 * 0.39inch _x005f_x000D_ Packaging weight: 10g _x005f_x000D_ Supports wireless 802.11B/G/N standards _x005f_x000D_ Support UART/GPO data communication interface _x005f_x000D_ Supports three working modes of STA/AP/STA+AP _x005f_x000D_ The wireless network is 2.4GHz and supports WPA/WPA2 security mode with built-in TCP/P protocol stack _x005f_x000D_ FLASH size: 4MB bytes D0~D8, SD1~SD3: used for GPIO, PWM, IIC, etc. A0:1 ADC _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Note: _x005f_x000D_ Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! _x005f_x000D_ Please allow 1-2cm measuring deviation due to manual measurement. _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Included: _x005f_x000D_ 1 x Development Board 1. ESP8266-Based Development Board: The NodeMCU development board is based on the ESP8266 WiFi module and is compatible with the for ARDUINO IDE, making it easy to program and use. 2. Multiple Communication Interfaces: The development board supports UART/GPO data communication interfaces, allowing for flexible connectivity options. 3. Three Working Modes: The NodeMcu Lua WIFI IoT development board supports three working modes, including STA, AP, and STA+AP mode, providing versatile functionality. 4. 2.4GHz Wireless Network: The board supports wireless 802.11b/g/n standards and uses the 2.4GHz frequency band. It also supports WPA/WPA2 security modes and has an embedded TCP/IP protocol stack.