+1 for the DSAN micro cue we got one last year and it has greatly reduced my stress level.
I can use it from 200’ away through walls with people in the way.
At around $450, it is expensive, but as far as I know, there is nothing cheaper that will do what it does.
Another great thing about it is that there are green and red cue lights on the receiver that indicate what buttons are being pushed on the transmitter...
That means that even if the moron *ahem* person on stage did not set the correct animation actions in PowerPoint for their embedded media, you can manually trigger the media for them.