Interval Gym Timer without Lights for Muay Thai, MMA, Kickboxing, Boxing, Martial Arts. This interval timer offers many options to fit your individual training requirements, our most adjustable interval timer, Round lengths can be set to 2, 3, or 4 minutes. Between round length can be set for 15, 30, 45 or 60 seconds. Intervals can be set to 15, 30, 45, 60 seconds, or no interval. Bell indicates round beginning and ending; beep indicates interval. One year warranty.