Adding a new device?

On 21st November, I received a notification from the Network Inspector, that a new device had been located on my page. It was described as a HITACHI make. I do not own any devices by Hitachi and I cannot find any other information about the application. 
How can I check to see how or who put this device on?

Hello Charles, 
Thank you for contacting AVG Community Support.
We understand you have received the notification from Network Inspector about new device located.
We are really sorry to know this. We'll certainly check and help you out.
Could you please let us know how long you are facing this issue?
Please share the screenshot of the notification you have received?
It would helpful for us to understand the issue better and provide you with a more efficient solution. If needed, please find a quick guide on how to take a screenshot here. | AVG (https://support.avg.com/SupportArticleView?l=en&urlName=avg-create-screenshot&q=screenshot&supportType=home
Thank you and keep us updated.

Hello Charles, 
Thank you for contacting AVG Community Support.
We understand you have received the notification from Network Inspector about new device located.
We are really sorry to know this. We'll certainly check and help you out.
Could you please let us know how long you are facing this issue?
Please share the screenshot of the notification you have received?
It would helpful for us to understand the issue better and provide you with a more efficient solution. If needed, please find a quick guide on how to take a screenshot here. | AVG (https://support.avg.com/SupportArticleView?l=en&urlName=avg-create-screenshot&q=screenshot&supportType=home
Thank you and keep us updated.