To activate your Light Up Musical Nemo Bubble Gun, remove pull tab on bottom, attach liquid bubbles canister provided, and press the button atop the gun to start fan spinning; this also activates music. Pull the trigger & bring on the bubbles! Let the machine warm up when fresh out of the package. Dimensions (W x H): 6.5 in. x 7.75 in. LED colors: Red, Blue, Green Comes ready to use with 3 replaceable AA Batteries.