From the Mr. Christmas Collection Item #78811 Using Radio-frequency identification technology, Maestro Mouse can play 12 favorite holiday tunes on his piano and can play up to 24 songs Presence activated, just place one of the music sheets on his piano and a song will play Change sheet music at any time to hear a different song Piano keys actually move Requires 4 "AA" batteries - not included Songs include: We Wish You A Merry Christmas, Jingle Bells, Deck the Halls, Silent Night, Joy to the World, The First Noel and more! Volume control dial Dimensions: 7"H x 12"W x 9.5"D Material(s): plastic/metal