The tool nicknamed the "Game Boy" is actually a key emulator that can generate a duplicate key from the vehicle's data, so a car can be taken over even while you still hold the genuine smart key.

Against this, we recommend add-on authentication (immobilizer-type systems) that prevents starting with the genuine key alone, and measures that stop the doors being opened in the first place—chosen to suit your model. The key is not to rely on one measure but to layer several. Please feel free to consult us for the best combination for your car.