For sale: The well-known Yamaha Digital Piano (Yamaha Portable Grand DGX-640). The piano has 88 full-size keys with weighted hammer action that mimics a classical piano, making it excellent for beginners and professionals alike. Model: Yamaha DGX-640 Condition: Very clean and fully functional, guaranteed. The sound is pure, and all keys and buttons are working perfectly. Accessories: Comes with the original sturdy wooden stand and power adapter.