This is a pretty common kit available from multiple sources, although it appears to have been originally produced by icstation.
The heart of the kit is a a potted chip, one of many similar boards primarily produced as the sound effects generators used in toys.
the kit adds supporting circuitry on a PCB to drive a piezo speaker and decode 4 switch inputs to select one of 16 effects.
As demonstrated here, it is possible to drive the board with a microcontroller.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
Does this generate good sound effects? No! Twee at best, horribly poor immitation at worst. But if you want to sound like a cheap toy, this may be exactly what you need;-)