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.

The medallion has 5 charges. While wearing it, you can expend 1 charge to cast Detect Thoughts (save DC 13) from it. The medallion regains 1d4 expended charges daily at dawn.