pre-recording module 1,COB board size:30mmx40mm 2,time:0- ... batteries7,comply CE &RosH8,Your OEM or ODM sound module also can be made by your design chart.9,Pls ... file format.10,It is very suitable for your greeting card,postcard,magazine,envelope or other ,Because you can direct ... doubleface adhesive paper to attach sound module on them ,then when you open greeting card to listen to your music or ...