This is for a used Elmo document camera (Model Number TT-02RX).
The Highlight feature allows you to point out a particular portion of the projected image by putting emphasis on an area of your choosing and slightly darkening the remainder of the image.
The advent of high-quality, reliable visual presentation is at your fingertips with the Elmo TT-02rx Teachers Tool. This compact and portable presenter is designed specifically for educational applications with high-quality imagery reproduced by its 1.39MP CMOS sensor, 30FPS blur-free motion video, and SXGA, WXGA, XGA selectable output resolutions. The Image Mate 2.0 software and built-in USB 2.0 interface offers video and audio recording capabilities when connected to your PC. Its lens features a 5.2x optical zoom, 8x digital zoom, and auto focus; and optimum image exposure on the (11 x 17") shooting base is achieved with its auto brightness functionality and a built-in white LED lamp. In addition, it features an SD/SDHC card slot, easy integration with microscopes, picture-in-picture display, intuitive on-board menu, and an IR remote control : compatible with GradeCam