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.
12 pc. Alligator Clips
12VDC SPST NC Contacts Relay
2 Piece Alligator Clip Test Leads
2 way coaxial cable splitter 5-900MHz