CASIO CTK-4400 Touch response keyboard with rich expressiveness through a range

Casio CTK 4400 Portable Battery-Operated Digital Display Keyboard 61 Keys

Casio CTK 4400 Battery Operated Digital Display Keyboard 61 Keys WORKS

Casio CTK-2300 Electronic Keyboard 61 Keys Portable Digital Piano – (Tested)

Piano Keyboard Casio CTK-2400 61-key

Casio CTK-2550 61-Key Portable Keyboard - Black SN: 862BDC305399157

Vintage Casio CTK - 1100 Electric Digital Keyboard 61 Key / Original Box - Works

Casio CTK-2000 61-Key Electronic Keyboard Synthesizer Tested and working