BiLiPro Page-Turner Pedal
BiLiPro Page-Turner pedal is designed to turn "virtual pages" with standard "Page-Up & Page-Down" keystrokes on a pedal. Simple USB installation, no need for drivers. Use it with PowerPoint slides, Word & PDF documents, music software such as Finale, Encore, Overture, ScoreWriter, etc. For iPads, use GigBook, UnrealBook, MusicReader, ForScore, MusicNotes, or SheetMusicDirect.
More information: http://www.bilipro.com/documents/products.html