https://techcrunch.com/2018/07/27/linkedin-adds-voice-messaging-because-weve-definitely-been-clamoring-for-that/

In a truly bizarre move, LinkedIn is adding voice messages to the professional networking platform.

The voice recording feature, which will roll out to all users over the coming weeks, is available via the iOS or Android app. Users can receive messages on both mobile and on the LinkedIn website. The voice messages can be up to one minute long.