Degonda-Rehab SA TwistT4 Operating Instructions Manual page 23

Drive mode speed reduction/ increase
With the speed buttons (1) you can set the driving profile Fahrprofil more concerted.
By pressing the speed buttons (1) you can set the driving
profile in 5 further steps. The button on the left reduces the
driving speed and the button on the right increases the driving
speed.
 If all bars are yellow, the lower speeds are
reached to 100%
 Every bar which goes out reduces the profil settings to 20%.
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