Electrically controlled fuel injection systems should be able to operate at low voltage. A positive traction gear assembly may be employed to switch between single and dual rear wheel drive. A cover element is attached to the securing element to protect the mobile electronic device. This may provide centralized andor coordinated distribution of notifications for a plurality of different virtual game spaces. A lid 7 is then welded onto the package base 11 using a laser welder, after which the preload frequency of the package 10 is fine tuned by using the laser welder to produce laser marks 21-28, 31-38 on the outside of the package 10. A second MOSFET is used as a resistive element.