NodeMCU is an open source IoT platform. It includes firmware which runs on the ESP8266 Wi-Fi SoC, and hardware which is based on the ESP module. ESP8266 is a low-cost, WiFi Module chip that can be configured to connect to the Internet for Internet of Things(IoT) and similar Technology Projects. NodeMCU features: USB-TTL, 10 GPIO, Every GPIO can be PWM. PCB antenna. I2C, 1-wire, Plug-n-play interface. The ESP8266 Integrates 802.11b/g/n HT40 Wi-Fi transceiver, so it can not only connect to a WiFi network and interact with the Internet, but it can also set up a network of its own, allowing other devices to connect directly to it. This makes the ESP8266 NodeMCU even more versatile. Package Includes 10 pcs LEDs, 1 pcs 4 channel 5 volt relay board module, 20 pcs Resistors (10 each of 330R and 220R), 1 pcs 840 points solder-less breadboard, 20 Jumper wires (M-M & M-F) for quick circuit connection on breadboard. Build and test your IoT application like home automation, robotics control over wifi cloud connectivity. Useful combo package for Arduino and IoT hobbyists, DIY stuff and Engineering Mini projects.