Quantum Earring of the Paranoid

Wondrous item, very rare
  Crafted for Lord Innes Ecure, this earring regularly scans the intention-spectrum for references to the creature whose ear or hearing orifice it pierces.
  Hot Ear. Whenever someone talks about you while you wear this earring—regardless of the plane on which you both currently reside—your ear becomes uncomfortably warm. As a bonus action, you can twist the earring, activating it in an attempt to listen in to the conversation. The creature that activated your hot ear must succeed on a DC 16 Charisma saving throw. On a failure, an invisible sensor is created within 10 feet of the target that lasts for 10 minutes. For the duration, you can hear through the sensor as if you were there. The sensor moves with the creature that triggered your hot ear, remaining within 10 feet of it for the duration. Once you activate this property, you can’t do so again until the following dawn.