I chose to go to their web site and register the license plates of all my vehicles/motorcycles. You won't need to mount/carry the silly thing or worry about someone stealing it off your bike. Works the same way, auto billed with applicable discount to the payment method you choose. You can also use it for parking/entrance to State Parks, facility's, city parking garages, tolls and is now reciprocal in other states as well. Very useful tool.