Medallion of Thoughts is a uncommon wondrous items in D&D 5e. It requires attunement.
Wondrous item, uncommon (requires attunement)
The medallion has 3 charges. While wearing it, you can use an action and expend 1 charge to cast the detect thoughts spell (save DC 13) from it. The medallion regains 1d3 expended charges daily at dawn.