The Rings of Shared Thought are always created as a pair. When slipped on a finger they slowly adjust to the size of the wearer while they attune. While worn by attuned the creatures they have the following abilities:

1. Telepathic Communication. The creatures may communicate telepathically as a free action. They do not need to have a common language. Communication is possible over any distance but it may not extend to different planes of existence. Communication must be actively pursued similar to speaking to someone however this communication is more intimate. This communication may not be blocked except by removing the ring.
2. Sensory Manifestation. As an action, either creature may experience senses through the other creature. This extends to sight, hearing, smell, touch, and taste. They are not in control the other creature but may observe all senses. While taking this action the target creature is aware of the other sensing creature. The sensing creature may not move or take any other actions. Their own senses are dulled and the action ends if they or the sensory target take any damage.
3. Sensory Bond. If either wearer receives any damage the other is immediately aware of the injury, its severity, and type of injury.
4. Probe Thoughts. Either wearer is able use an ability of the ring similar to Detect Thoughts. This action may be used once per day. Its range is unlimited within the same plane of existence. Its target is limited to the other wearer.
5. Find Pair. Once per short rest a wearer of one ring may attempt to find its paired ring. This may be done regardless of that paired ring's attunement or equipped status. The action is similar to Locate Object except its distance is unlimited within the same plane of existence.  

The rings are most commonly not found as a pair and their particular abilities will not be revealed without an identify spell or a helpful creature wearing the paired ring.

Notes: creatures with intelligence scores of 3 or more, Communication, Social, Scrying