First off, does the red S shine on your instrument panel?
If not doubletap till it does.
Secondly, as far as I know, there is no es4.
At least not on the Segway product page.
Chances are you have been con'ed.
Do you have a link to where you bought it?
(Gotta love Chinese knockoff of Chinese products)
no_segway_es_4_2018-12-21.jpg