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Key Features:

• Workout round lengths can be adjusted to 2 or 3 minutes, rounds from 1 to 12 and rest time between rounds from either 30 or 60 seconds.
• An audible bell sound and/or vibration feature alerts athletes to the start and end of each round.
• Can be worn securely around arm with elastic band provided, clipped to shorts or stand alone.
• Personal 3" x 2" x 1.25" size is ideal for every level athlete from beginner to professional.
• Requires 3 AAA batteries included.