There is a suspicious device connected to external Virgin Media box
Yesterday there was a power anomaly that turned off my external monitors for 1-2 seconds and my router was stuck on solid green light and green wifi symbol with no internet connection for around 2 hours.
Today walking back home at night time I noticed a device hooked up to my external Virgin Media box with two green lights. (Note: my neighbour is ground floor and I am first floor.)
The photograph is a tad blurry as I didn't want to be obvious that I was taking photograph of it as I did not want to face a conflict with my neighbour.
I've done some searches online and I cannot see this mentioned anywhere before on Virgin Media Community or google images.
Is this a device used by my downstairs neighbour to steal internet (and possibly tv) through this external Virgin Media box?
If this isn't a theft device, what is it?