You're just using the bare switch, correct? Do you have a multimeter? Set it to continuity test or ohm meter with buzzer. Probe a couple of pins and press the switch. If you hear it beep when the switch is pushed down, then those are the pins to use.
Test the voice activation by momentarily connecting the two wires together. If it works, then wire up the switch.
The other pin on the switch is the back light.
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