voice chip 1,COB board size:30mmx40mm 2,time:0-270seconds 3,with double ... adhesive paper 4,pull tab switch voice chip1,COB board size:30mmx40mm2,time:0-270seconds3,with double-face adhesive ... or wave file format.10,It is very suitable for your greeting card,postcard,magazine,envelope or other ,Because you can ... sound module on them ,then when you open greeting card to listen to your music or melody.