Chris Welch, The Verge:

Similar to voice tweets, voice messages have a bare-bones, simple interface: there’s just a play / pause button, and the sender’s avatar pulsates as the message plays. The product team designed an “in-line recording experience to make it easier to send these messages as part of the natural conversation flow,” so that’s one difference from the current audio tweets interface. There’s a “report message” option in the event that someone misuses voice DMs, which is always a fair concern with private audio.

It’ll start testing in Brazil.

Immediate thought: The terrifying messages that some people get slid into their DMs will be so much more so amplified by voice. I sure hope Twitter tests the hell out of this, and plans to be vigilant in response to complaints.