So the PDAs will work how they work in the first two games, you pick them up and then the voice message starts playing. Imagine you were playing multiplayer with your friends and you have just left your base. Your friends will have no idea where you went, but if you craft an item (like PDA recorder or something I don’t know about the name) and use it, you can record your OWN PDA message, and when someone picks it up they can listen to your voice message. Not only would this be really helpful, it would be really cool and make the game more imersive, instead of messaging your friends where they went you could listen to their very own voice-recorded PDA.