Hubs & Switches descriptions： We use high-quality raw materials, all materials are very suitable for the product, please rest assured to buy. For Nodemcu Lua Wifi Networking Based Esp8266 Testing Diy Board. Features: ESP8266 is a Highly Integrated Chip Designed for the Needs of a New Connected World. NodeMCU, is an Open Source Networking Platform. It Uses Lua Scripting Language Programming It Offers a Complete and Self-contained Wi-Fi Networking Solution, Allowing It to Either Host the Application or to Offload All Wi-Fi Networking Functions from Another Application Processor. ESP8266 Has Powerful On-board Processing and Storage Capabilities That Allow It to Be Integrated with the Sensors and Other Application. Specific Devices Through Its GPIOs with Minimal Development Up-front and Minimal Loading During Runtime. Specifications: Color:black CCL ESP8266 Module: This Baseboard is Fitted with an Onboard Switching DC-DC Buck (wide Input Range) and a Standard 5.5 X 2.1 Mm DC Socket, Mounting Holes and Numerous Headers Are Available to Esase NodeMCU V3 Module Usage Allows Developers to Deal with the Underlying Hardware in a Manner Similar to for Arduino Applies to the Basic Testing of the DIY Breadboard for LoLin V3 NodeMcu Lua WIFI Material:CCL Size:6*6cm Metal ESP8266 Module: Its High Degree of On-chip Integration Allows for Minimal External Circuitry, and the Entire Solution, Including Front-end Module, is Designed to Occupy Minimal PCB Area. Great Way to Connect Your Arduino or Other Microcontroller Projects to a WiFi Network. Prototype Your IoT (Internet of Things) Products Within a Few Lua Script Lines. Power Your Developement in the Fastest Way Combination with NodeMCU Firmware. Type:ESP8266. Wireless Standards: 802.11 B / G / N. Frequency Range: 2.4GHz-2.5GHz (2400M-2483.5M). Data Interface: UART / HSPI / I2C / I2S / Ir Remote Contorl GPIO / PWM. Operating Voltage: 3.0 ~ 3.6V (recommendation 3.3V). Working Current: Average: 80mA. Operating Temperature: -40 Celsius ~ 125 Celsius Storage Temperature: Nomal Temperature. Material: Metal Size: 11.4 X 6.8 X 0.4cm Package Included: 1 Pcs MCU Module for LoLin V3 & 1 Pcs MCU Module. Products number : SOMONO99355