... ,COB board size:30mmx40mm 2,time:0-270seconds 3,with double-face adhesive paper 4,pull tab switch voice chip1,COB board size ... :30mmx40mm2,time:0-270seconds3,with double-face adhesive paper back4,pull tab switch5,speaker:29mm,38mm,40mm or ... ,envelope or other ,Because you can direct tear the doubleface adhesive paper to attach sound module on them ,then when you ...