This magical device is composed of two orbs: an “emitter” orb that captures the thoughts of anyone nearby and transmits them to another orb, called the “receiver”.
Convenient for spying, it is said to have been designed by gnome engineers hired by the Ebon Syndicate.
The emitter orb measures barely half an inch and weighs less than a marble, which makes it very easy to slip in a pocket or attach to a piece of clothing.
A creature holding both orbs can activate them by using an action and touching them together.
Once they are active, any creature that moves within a 5-foot radius of the emitter orb, or starts its turn within 5 feet of the orb, must make a DC 13 Wisdom saving throw.
On a failed save, any attuned creature holding the receiver orb becomes immediately aware of that creature's current surface thoughts.