Thank you for viewing. This is a TOMBO baby harmonica, a necklace type. The harmonica size is about 3.5cm in length. It is a super-compact C-major harmonica with 8 notes in one octave, allowing you to play many songs. I cannot confirm if it actually produces sound. Simple sheet music for "Under the Spreading Chestnut Tree," "Twinkle Twinkle Little Star," "When the Saints Go Marching In," "Camptown Races," "Oh! Susanna," and "If You're Happy and You Know It" is included. As shown in the fifth photo, there are stains and yellowing on the inner card. This was found while organizing my parents' house. It is unused, but please understand that it has been stored at home, so please purchase it with that in mind. Also, please refrain from claims or returns. It will be shipped via Mercari delivery. Recycled materials may be used for packaging. Thank you for your understanding.