Here is a link to Yamaha's Advanced Portable keyboards, which has features and specs on PSR1100 and PSR2100: http://www.yamaha.com/yamahavgn/CDA/List/ModelSeriesListLE/0,6583,CTID%253D205500%2526CNTYP%253DPRODUCT%2526VNM%253DLIVE%2526AFLG%253DY%2526LGFL%253DN,00.html
Starkeeper