* 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
