First of all, apologies if this is a noobish question; I'm a tinkerer with no engineering background.
I bought a device with two buttons on it. After taking it apart, I saw that these are connected to a small PCB with 5 wires sticking out, which in turn are connected to the main PCB of said device.
I want to find out what exactly is happening inside of those five wires in response to pressing either of the buttons. How can I "listen in" to what happens inside of the wires?