Source: Phandelver and Below - The Shattered Obelisk

Ring, Uncommon (Requires Attunement)

This ring has 6 charges. While you wear it, you can expend 1 of its charges to project your voice to be heard clearly by all creatures within 1 mile of yourself, regardless of intervening noise, for 1 minute. Magical silence, 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood blocks this projection. If you project your voice while speaking a language the listening creatures don’t understand, you can make the creatures understand what you’re saying. You must be able to see the creatures to make them understand. The ring regains 1d6 expended charges daily at dawn.