There's an Ap that you can get on your mobile that enables you to punch in the reg number and bingo
The other is a transmitter and receiver that came be bought online if you know whare to look that reads the fob in a house .
The set up was a big mistake in the first place
My neighbour has nurses calling three time a day to see to her needs as she mobile and need care
One day her daughter visited from Southampton the nurs called with almost the same car .. when she left she piked up the daughters key by mistake and drove off to the next location 30 miles away she also had her own key and fob in her pocket so another 30 miles drive back.. so the daughter could go home
I know this could happen with the old fashioned key .. but unlikely.