You have to continuously look at the tiny (make it bigger, or set the back ground to red, then green when you’re good to go) timer on the top screen of your phone to know when to start again. If it could beep a slightly different tone halfway through the count down. Then beep again at 3, 2, and 1 second(s) so you don’t have to stare at your phone. Showing the timer on the Apple Watch would be good also. The Seconds App does a really good job with this.