Secret-catching Pearls
Wondrous Item,
Uncommon
(cost 400 gp)
Crafting Components
The recorded secrets of six creatures (at least one of these creatures must be present for an hour of the item’s crafting time)
This necklace is a work of art; a delicate golden chain with a shower of 2d6+2 pearls affixed to it. As a bonus action, you can detach a pearl. On your subsequent turns, you can use your bonus action to listen through the pearl, allowing you to hear as though you were there. This effect ends after ten minutes or if the wearer removes the necklace.
Once all pearls have been removed, the necklace becomes a mundane gold chain worth 30 gp.
Source