> For the complete documentation index, see [llms.txt](https://docs.phoenixlidar.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.phoenixlidar.com/hardware-and-interfaces/navbox/scout/using-the-cpu-sensor-button.md).

# Using the CPU/Sensor Button

![CPU Button and Sensor Switch on the side panel of the NavBox](/files/-MCIEdn0hbFpPInXcl05)

## **Turning on the CPU**

The CPU will turn on automatically when power is supplied to the MR30 input connector. The CPU button will light up green, indicating that the CPU is powered on. In a rare case where the CPU button does not light up green after power has been supplied, the CPU can manually be turned on by a single button-press.

## Shutting down the CPU

Before pulling the power connector from the unit, the CPU needs to be shut down properly. This can be done by a **single button-press**. Once the CPU is completely shut down, the CPU light on the button will turn red. After that, power can be unplugged from the unit. Shutting down the CPU will also shut down attached LiDAR sensors.

## **Turning on the LiDAR sensor**

Once power has been supplied to the unit and the CPU is powered on (CPU button LED ring is green), **long-press** in the Sensor switch to the ON position to turn the sensor on.

## **Turning off the LiDAR sensor**

To turn the sensor off, **long-press the Sensor switch** on the system to the off position.