Most kind of teleprompters use beam splitter glass to implement the function of the prompting.
President teleprompter use a monitor to play the speech draft. Above the monitor, there is a supporting bar holding a piece of beam splitter glass. Adjust the height of the glass, so that the speaker can see exactly what is reflected on the monitor.
One important thing: to make sure the contents on the monitor is mirrored, you can use a software, or use a monitor with self-reversing function directly.
TY-PT17 use self-reversing monitor. Can not only supports TXT and Word formats of traditional teleprompters, but also supports PDF, PPT, video, web pages, pictures and other forms, allowing you to fully express yourself in front of the public.