Tiny GPS signal Jammer Blocker. It's designed for blocking GPS trackers which may be hidden in your car, truck, van, motorcycle, vehicle etc. A car gps jammer blocking GPS reception and prohibits all GPS-enabled devices from tracking your current location. It works on car cigar/cigarette lighter socket.
These are illegal in the UK to sell, use or own under ofcom rules. If you get caught, there is up to £5000 fine.