Fangrui Product Details [multi-function Interval Timer ]the Countdown Timer Has 5 Different Modes (normal Time Mode, Countdown Mode, Count-up Mode, Stopwatch Mode,interval Mode). [visible Led Gymtimer] With The Led Display And Loud Buzzer Of The Interval Timer,clear Led And High Contrast Display Allows You To See The Bright Led Numbers From All Corners Of Your Gym Or Home. The Numbers Are Brightly Displayed And The Alarm Is Loud Enough To Hear But Not Too Loud.timer Be Beep 3 Times When Time Counts Down 3 Seconds [pre-programmed Timer]- This Timer Comes Preprogrammed Timer Settings. Button: Store 20seconds Work Time And Rest Time, Repeat 8 Times; Fgb1 : Store 5 Minutes Train Time, 1 Minute Rest Time, Repeat 5 Rounds; Fgb2 Button: Store 5 Minutes Workout Time, 1 Minute Rest Time, Repeat 3 Time.there Be 10s Preparation Time At Each Start [customizable Interval Timer]- You Can Program And Store Your Workouts With The Amount Of Work Time Versus Rest Time With Numbers Of Rounds. It Also Can Do A Lot Of Hiit Training And So It Helps