We placed the 3rd headset in a waterproof case and 'tied' the microphone to an audible alarm generated by multiple motion sensors. Then at dusk activate the 3rd receiver and when we go to bed turn on the main and 2nd receivers (high volume) - yes, you can sleep with it! Checked. Any movement of more than 3 feet in our place will wake us up without the intruder's knowledge. ATTENTION NIGHTBREAKER!
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