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Use message-received beep to trigger a relay for remote control of electrical devices?

I want to leave my InReach Mini at home to turn on a water pump if there’s a wildfire while I’m away. Any tips? Does anyone know which what current the beeper draws? Thought I would ask here before using a probe and my ear to find the beeper. I’ll probably take the device to a cell phone repair shop for the soldering, but need to be able to tell them where to tap in. 

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