Light Activated Music Modules
- RVFM BKL-09M-56, This music module plays the tune Old Macdonald Had a Farm every time it is activated. These modules, originally designed for sound-based mugs, can be used in a variety of student projects. They are small & robust & are ideal for placing into boxes that require a tune to be played when the lid is opened. Mug Music Mod. Old Macdonald