The digital recorder.
Radio broadcasts in the future if they every allow preloaded recordings.
Robots with the right modules if they ever allow preloaded recordings.
By the timer function I mean set it to play after a certain amount of time. It'd allow for scenarios where someone could plant an item ahead of an event, set it to go off when the event starts or in the middle of it, putting out prerecorded stuff and opening up the potential and possibilities of these items to help drive events and RP.