Bring your marble run to life with our patent pending Lights & Sounds pieces. These 2 Wacky Sounds pieces will transform your marble run with 14 different sounds. When the marble rolls over the trigger, lights flash and a random wacky sound plays out of the large speaker. The see-through pieces allow your curious child to see the inner workings of each piece, inspiring imagination and learning. Each piece includes an on/off switch, as well as 3 button cell batteries.