Maybe a recording like what plays here on the base loudspeaker throughout the day. "You have entered a secure area where deadly force is authorized" .I was thinking about this. What about a motion detector that was set up to play audio?
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MicroSound Voice Motion Sensor - Waytronic
MicroSound Voice Motion Sensor Description: Motion sensor audio player ' s detection range is up to 13ft(4m), 120° view angle. It will trigger the soundwaytronic.ca
I SEE YOU ON MY CAMERA! LEAVE THE PROPERTY OR I WILL CALL THE POLICE
fake surveillance cameras

