This LED will turn on when the D7 pin is set to HIGH. The D7 LED is next to the D7 pin on your Electron, on the upper right quadrant.The color of the RGB LED tells you what mode your Electron is currently in. The RGB LED is in the center of your Electron, above the module.
You can use these buttons to help you set your device's mode.
The MODE button is on the left and the RESET button is on the right. There are several awesome buttons and LEDs on your Electron to make it easier to use. Consider this battery your Electron's best friend! The Electron comes with a standard 1,800mAh 3.7V LiPo battery (rechargeable) which allows the Electron to be powered over long periods of time without needing a connection The USB cable provides a means to charge your Electron as well as send serial and DFU commands to your device. It will operate for all 2G/3G frequencies that yourĮlectron needs, depending on the version you have. The cellular antenna is imperative for the Electron to reach connection to a cellular tower. There are pins for Serial/UART communication, and a pin for resetting your device. There are also pins to allow you to power your device, or power motors and outputs outside of your device. GPIO pins can be hooked to sensors or buttons to listen to the world, or they can be hooked to lights and buzzers to act upon the world. Pins are the input and output parts of the microcontroller that are exposed on the sides of your device. The microcontroller interacts with the outside world using pins. This application can be simple (just a few lines of code), or very complex, depending on what you want to do. Unlike your computer, it can only run one application (often called firmware or an embedded application). It runs your software and tells your prototype what to do. The microcontroller is the brain of your device. It connects your device to the internet in the same way that your smartphone might connect to its cellular network. The cellular module is also accompanied with a Particle SIM card. 
This is probably why you bought your device- the cellular module allows your Electron to communicate with the internet in over 120 countries!
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