This is the circuit board and speaker from an arcade machine, we think. When you power it up, it flashes its lights and beeps & boops along. 3V seems to work ok for power. The different switches trigger different sounds.
Look, we made a video.
"Camping is In-Tents" Canteen with Carabiner
"German" Sun und Dust Goggles
"I'm Appreciated" Pin
"The Great American Train Company" Blue and White Striped Train Engineer Hat