Sound Brick 4 x 4 with Random Transformer Soundwave Sounds

Sound Brick 4 x 4 with Random Transformer Soundwave Sounds (part 3677c03) is a Electronics used in 1 official LEGO sets. Scan or search to authenticate loose parts and check market value. Open the parent-set list to see which themes and years used this mold — essential when a common shape appears in a rare color or print.