Helena controls the mouse with her mouth and lips. She uses an adapted trackball mouse. The mouse buttons are fitted with small pieces of hard plastic (like a credit card) and also controlled with the lips. The mouse sits on a mounting plate, see associated tip.
Model: Trackman Marble
Logitech, logitechg.com/en-us (mouse), Helena’s husband (adaptation) (last checked March 2020)
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This tip is from 2009