> For the complete documentation index, see [llms.txt](https://docs.xbstation.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xbstation.com/xblink-basic/xblink/led-indicator.md).

# LED indicator

| LED       | Color  | Description                       |
| --------- | ------ | --------------------------------- |
| Main led  | RGB    | Indicates the status of XBLink    |
| SYS led   | Green  | System led                        |
| LTE led   | Blue   | Status of the cellular connection |
| Power led | Yellow | On/Off                            |

![Main led](/files/-Ma70gUFR66pQ94bFh0l)

![SYS Led, LTE Led and POWER Led](/files/-Ma70JLwD0X9u0JtuNN0)

### 1.Main Led

| **Color** | Blink                                                         | Solid                                       |
| --------- | ------------------------------------------------------------- | ------------------------------------------- |
| Red       | Start up, Initializing                                        | Error                                       |
| Blue      | Trying to establish cellular network                          |                                             |
| Green     | XBFirm process is running - waiting the singal from Pilot App | All good - XBLink is connected to Pilot App |

> If the network cannot be connected, please check your hardware connection (SIM card status, antenna) and apn configuration, the current network environment.

### **2.SYS led**

* Blinks - Normal operation
* Solid - Firmware Upload

### **3. LTE led**

* When the connection is established and data is being transmitted/received, this led will blink at special intervals. Otherwise, if there is no connection, the led will remain off.

### **4.Power led**

* Light - Power is OK
* Off - No power input