Casio CTK-491 Electric Keyboard, 61 Keys, 100 Tune Song Book, 100 Tones, 100 Rhythms, Auto Accompaniment/MIDI Compatibility, Includes Adaptor To Power The Unit or Use 6 AA Batteries (Clean Compartment), Works Great,
41. Casio CTK-491 - YouTube
CASIO CTK-496 ELECTRONIC KEYBOARD USER MANUAL | ManualsLib
Casio CTK-491 Musical Information Center Electronic Keyboard | eBay