Beep Every 20 Seconds

Beep every 10 seconds Beep every 15 seconds Beep every 20 seconds Beep every 30 seconds Beep every minute Beep every 2 minutes

Beep every 5 minutes Beep every 10 minutes Beep every 15 minutes Beep every 25 minutes Beep every 30 minutes Beep every hour