... 1, 000gsm gray board, 250gsm paper, 800gsm gray board, and sound bar(ABS plastic material) Finishing: UV varnishing and glossy lamination ... quality acoustic and long time duration. Operation: turn on the sound Button, the pre-recorded sounds can be heard when pressing ... the picture book. The batteries can be changed .Customized sizes, sound and printings are welcome Function:For pre-school education of ...