pre-recording module 1,COB board size:30mmx40mm 2,time:0-270seconds ... batteries7,comply CE &RosH8,Your OEM or ODM sound module also can be made by your design chart.9,Pls ... and message to us with mp3 or wave file format.10,It is very suitable for your greeting card,postcard,magazine ... can direct tear the doubleface adhesive paper to attach sound module on them ,then when you open greeting card to listen ...