The remote control units are placed on a piece of foam rubber on a small table. The foam rubber prevents the remote control units from slipping away. The user presses the buttons with his writing stick.
The user steers his electric wheelchair with Drivelink, a steering system from Permobil that can be used both to control the wheelchair and as an environmental control system. He is not satisfied with the environmental control system in the drive link. He feels that there are many functions he does not need and that the functions he wants to have do not work.
He therefore uses other remote control units to control his environment.
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This tip is from 2007