pre-recording module 1,COB board size:30mmx40mm 2,time:0-270seconds 3,with double-face adhesive paper ... ,COB board size:30mmx40mm2,time:0-270seconds3,with double-face adhesive paper back4,pull tab ... module also can be made by your design chart.9,Pls send your customizable recording sounds and message to us with ... the doubleface adhesive paper to attach sound module on them ,then when you open greeting ...