# USB markers

To configure markers sent by a USB device:

1. Click on **Settings** which can be found at the top right-hand side of EmotivPRO.&#x20;
2. Click on **USB marking** from the menu on the left-hand side of the screen.
3. Go to the USB Device drop-down list and select the USB device you want to connect.&#x20;
4. If you don’t see the USB device you’re looking for in the drop-down list, click on **Refresh device list**.&#x20;
5. Once you’ve selected a USB device, click on **Start**.&#x20;

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Please note:&#x20;

* USB mouses and USB keyboards are not supported.&#x20;
* Marker values from a USB port are in the range of 0 to 127.&#x20;

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You will see a vertical pink line in the data stream in Raw EEG, Performance Metrics and Motion Sensors views when a marker has been added successfully and will be able to view the markers in the session timeline and exported data file.\
