Check the listing for details. Miracle Piano Teaching System Keyboard Electronic 49-Key w/ Power Supply Working. Color: Black, Condition: Used, Made in China. Listed at 80.99 USD. Up for sale is a classic Miracle Piano Teaching System Electronic Keyboard. This vintage 49-key keyboard is renowned for its innovative approach to teaching piano, making it an excellent choice for beginners and those looking to relive a piece of music technology history. The unit features built-in speakers, multiple instrument voices including Piano, Organ, Harpsichord, Synthesizer, Vibraphone, and Electric Piano, along with volume control. It includes MIDI In/Out, headphone output, and stereo audio outputs for versatile connectivity. The keyboard is in good cosmetic condition with some signs of use typical for its age. Comes with its original power supply. Perfect for collectors, music students, or anyone seeking a unique electronic keyboard experience. Tested and fully functional.