The on/off switch changes to push button to activate the power. since the power is cut off automatically, it's trouble to turn off and on again to play ( always forget to turn off after play). For Tamiya Q-steer, since there is no switch, the car has to be charged again even there is still power in the battery after play. The power will drain off after couple of hours. It may shorten the life of battery. The push-activation button may be a nice way to conserve power.