Don't get me wrong.  I love this toy.  My two autistic sons and "normal" daughter love these gears.  But a change is necessary.  As a reviewer, you may not think much of this needed change.  But the company has not realized that the "on"/"off" switch is not that.  It is one way or the other on either side, and then in the middle is the "off" mode.  (On the left of the toy, there is a switch for fast or slow".) I would have to guess that 75 percent of the purchase of this toy is from people with autistic children or therapists for such.  That being said, the "on"/"off" switch should be just that, a choice between "off" and "on".  My two (autistic) sons are never able to figure this switch out.  And they are far away from each other on the spectrum as far as the disorder is concerned.  Other than that, batteries last long and the toy gets much use.  Thanks for hearing me out.