Rotor Gen 1 = No velcro straps on batteries, No shark Fin.
Rotor Gen 2 = Velcro straps on batteries, No shark Fin.
Rotor Gen 3 = Has Velcro straps on batteries also has updated shark Fin.
You could get the velcro straps and updated shark fin from Dye.
If someone has a Gen 1 with the updated parts, it makes no difference whether it is a Gen 1 or Gen 3, everything else is the same.