8-button control with 7 scale buttons and 1 built-in music playback button. 18 preloaded tunes: 18 music notations are stored in the microcontroller and cannot be changed or updated. Simple, reliable operation: use the 7 scale buttons to access musical scales and the dedicated playback button to listen to the built-in tunes; no external software or file transfers required. Consistent performance: the built-in tunes are fixed, ensuring the same sound and sequence every time you use the device. Compact, versatile design: compact form factor suitable for home practice, classroom demonstrations, or small rehearsal spaces. Use scenarios: - Music practice and learning: navigate scales with the 7 buttons and play the built-in tunes to study melody and rhythm. - Classroom demonstration: a compact tool to illustrate scales and tunes during lessons without needing additional equipment. - Therapy or focus sessions: short, built-in melodies can support focus and calming routines. Key attributes at a glance: - 8 total buttons (7 scale, 1 playback) - 18 fixed tunes stored in microcontroller - No external updates or file changes required - Compact design for easy placement and use