Interval Workout Timer TMR06 - with EXTERNAL SPEAKER OUTPUT: MMA, HIIT, Boxing, Wrestling, Martial Arts, Fitness, HIIT, Endurance, Weight Lifting Jack to connect to an external speaker system MMA, Boxing, Wrestling, Martial Arts, Fitness, HIIT, Endurance, Weight Lifting EASY Interval set up: work time - T1, rest time - T2, number of intervals - # (59 intervals max), ENDLESS number of intervals mode LOUD sound ,ON/OFF switch, easy key layout Mounts on a wall or equipment frame