Regular: The basic, original size (approximately 27 cm). It does not have an audio output and is ideal for beginners.
Deluxe: The large, upgraded version (approximately 44 cm). Features a 3.5mm jack for headphones/amplifier, volume control, and a more comfortable strap.
Melody: Mini keychain edition. It does not have a free ribbon for notes, but plays pre-recorded songs at the press of a button.
Classic: The classic, standard version of the first generation (same size as the Regular), focused on basic colors without extra features.
Techno: Deluxe size, but with the ability to connect to a smartphone (via OTM Link) to change sounds through an app.
