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TROUBLESHOOTING
Hear-through audio is not activating:
1. Assure that the battery caps are tight.
2. Press and hold the + volume button down. If hear-through is off, it will power
on. If the volume is set too low, it will ramp up.
3. If you have a NFMI headset, and are not using the NFMI earplugs, try pressing
the NFMI toggle button to see if audio returns.
4. Replace the batteries with new ones, and repeat starting at step 1.