This one plays 3 songs. Jingle Bells/Santa Claus is coming to town/We wish you a Merry Christmas. Starts by pressing metal top. Plays 25-55 seconds depending on tune. Replaceable battery lasts for 1000's of plays. Glue in or flush mount installation. Pom-poms and other items can be glued on top to cover it. Use sound cup when sewing it into sfuffed animals. 1 3/8" diameter, 3/8" thick.