Source: Tal'Dorei Campaign Setting Reborn

Wondrous item, uncommon

This dull-blue river stone is soft to the touch, and makes remarkably little sound if dropped. When an echo stone is squeezed as an action, it glows faintly for 1 minute. The stone records all sound made within 15 feet of it while glowing, then repeats that recorded sound at an equal volume once every 5 minutes. This cycle of repetition continues until the stone is squeezed again as an action, which silences it. Squeezing the stone twice in quick succession as an action causes it to play the sounds it has most recently recorded, rather than recording new sounds.