pre-recording module 1,COB board size:30mmx40mm 2,time:0-270seconds 3,with double-face adhesive paper 4, ... button batteries7,comply CE &RosH8,Your OEM or ODM sound module also can be made by your design chart.9,Pls ... can direct tear the doubleface adhesive paper to attach sound module on them ,then when you open greeting card to listen ...