37 Keys Roll Up Piano for kids

* Harmless waterproof silicone as material, can be rolled up * Color: black,pink,blue or OEM color * 6 demo songs, 8 tones * 1K1N teaching function * USB charging DC 6V * Without built-in battery * Can be supported by 4pcs AA dry batteries (not included) * Built-in speakers, can connect to headphone/external speakers too