pre-recording module 1,COB board size:30mmx40mm 2,time:0-270seconds 3,with double-face adhesive paper 4,pull tab switch pre-recording module1,COB board size:30mmx40mm2,time:0-270seconds3,with double-face adhesive paper back4,pull tab switch5,speaker:29mm,38mm,40mm or others.6,batteries:2xAg10 or 3xAg10 button batteries7,comply CE &RosH8,Your OEM or ODM sound module also can be made by your design ...