I've done vipassana retreats where they play audio files from Goenka's instructions. You can do the same with a phone. I've used analogue timers to determine w

I've done vipassana retreats where they play audio files from Goenka's instructions. You can do the same with a phone. I've used analogue timers to determine when to get up from my session. Please explain the difference between an analogue timer and a digital one, for this purpose.