Lucky Line Products Large Magnetic Key Hider, 1 per Card (91001)

Does this key case block rf signals? i have a key less entry fob. it allows the car to be opened without a key as long as the key fob is near the car.

Will this hold a credit card?

Will this hold an automobile key fob that measures 3x1.5x.5 inches?

How strong is the magnet on the back?