The keyed call/send controls can be added at the landing areas of the vertical wheelchair lift as an extra option. The new new setup would include the controls and a set of keys that is required to operate the controls.
The keylock controls are made to disable controls when the keylock is turned off. When the keylock is turned to the ON position, the pressure-sensitive rocker keys will work accordingly. The control options include UP, DOWN, and a STOP button in case of an emergency. The secondary controls are installed at either the top or bottom landing areas.