Odd shared device appearing
In the Finder sidebar there's my router – fine – followed by a random device with an 8 figure alphanumeric – 2 letters 'wl' then a 6 figure number. I'm guessing this must be my wife's windows laptop but am a little concerned, however unlikely, that it could be someone accessing my computer. My Firewall is on and File Sharing in Systems Preferences is switched off so I'm pretty sure I'm safe but how would I find out what the device is? Could it be found on my wife's laptop?
All help appreciated.
Michael
MacBook Pro