The Ferris wheel uses 3 No. 5 batteries and 12 music songs (without battery included)Dream sitting lamp uses 3 pieces of 1.5V "AG10"(2 pieces per box)Use 3 pieces of 1.5V "AG10" for multi-angle spotlights (2 pieces per box)Use 3 1.5V "AG3" pieces for the third gear card light (1 capsule per box)Use 1 3V "CR1220" for colorful ball balls (6 capsules per box)Coin battery built-in non-replaceable colorful roller balls without electricity insulation