You create an invisible sensor within range in a location you can see or one that is obvious, such as around a corner or in the next room behind a closed door.
The sensor remains in place for the duration and cannot be attacked or otherwise interacted with.
Once the spell is cast, you can hear anything within 15 feet of the sensor as if you were standing in its place.
Whispered voices, or noises outside the 15-foot circle, require a DC 10 Wisdom (Perception) check, rolled with advantage, to make out clearly. No further checks are required unless the noises move farther away from the sensor.
A creature that has truesight, or has the benefit of see invisibility or similar spell, can spot the sensor, which appears as a spectral, curved ear horn about the size of your fist.
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