HeadMaster

An early head-pointing assistive technology device developed by Prentke Romich Company that translates head movements into mouse cursor movements on screen. The HeadMaster uses an ultrasonic sensor worn on the head (typically mounted on a headband or glasses) to track head position relative to a receiver unit placed on top of the monitor. Mouse clicks are typically performed using a sip-and-puff switch or external button. The HeadMaster was one of the first commercially available head-tracking devices for computer access, enabling people with severe motor impairments who retain head control to operate standard computer applications without a hand-operated mouse.