... customer's voice 2,Each picture with relative music 3,OEM 4,Children's education Coardboard book+sound module+customer's voice ... 1, 000gsm gray board, 250gsm paper, 800gsm gray board, and sound bar(ABS plastic material) Finishing: UV varnishing and glossy lamination ... at the same time, reading the picture book. The batteries can be changed .Customized sizes, sound and printings are welcome Function:For ...