The TYU-30 by Yamaha.

Is a Vintage rare Keyboard. TYU-20/30: Introducing children to the wonderful world of music
The TYU20/30 portable keyboards splashed onto the scene in 1984, with a palette of bright, exciting colors and fun design that proved to be irresistible to children.
In fact, these 25-key, two-octave models were specifically designed to appeal to children.

The TYU-20 had a bright red body featuring a large treble clef accompanied by a stylized eighth note, and featured 20 preset songs with selectable tempos. In addition to a Piano Voice, the unit had a Human Voice that called out the names of the notes, a distinctive feature that stimulated children’s curiosity.

In contrast, the vivid blue TYU-30 offered a fuller range of functions.
It came with two music cartridges with 10 songs each and a microphone, and had different settings to allow children to listen to the songs, play them, or plug in the microphone and sing along.
The unit also had a rhythm function with a selection including Waltz, Swing, Rock, and Latin, and a function that automatically supplied orchestral and rhythmic accompaniment when a song was selected.
LED lights on the keyboard lit up to show the children which keys to play in which order, helping them progress.
The model also had an AUX OUT port to connect to external speakers.
Despite their miniature size at 25 keys, these portable keyboards played a major role in introducing children to the wonderful world of music, especially in Europe and the United States.

Specs:

• Type: Fun‑Keyboard / Super Mini Keyboard
• Keys: 25 mini keys
• Polyphony: 4 voices
• Tone Generation: PASS (square‑wave)
• Rhythms: 4: Waltz, Swing, Rock, Latin
• Music Cartridges: Comes with 2 pre‑loaded song cartridges (10 songs each)
• Key Lighting: Yes. Small red LEDs above the keys to teach which key to press.
• Microphone: Included for sing-along functionality.
• Power: Uses 4 × AA batteries
• Dimensions: 378 mm (W) × 114 mm (D) × 22 mm (H) per Yamaha’s chronology page.
• Release Year / Era: Listed in Yamaha’s 1980s timeline.
• Target Audience / Use: Designed for kids / beginners / educational “fun keyboard.”

Owner's manual