High Tech - dedicated device 2. High Tech - dedicated device 2. High Tech - dedicated device 2. High Tech - computer 2. Lite Tech 2.
Press stick or switch for selection.
Developed for early telegraph system more than 100 years ago. Used effectively with sip and puff switch. Requires limited physical control. User need only make a single replicable movement anywhere on the body, finger, arm, leg, foot, toe, head, face. May be less physically fatiguing.