The GYMBOSS is a small, easy to use, repeating interval timer. This multi-use timer has many versatile functions that make it beneficial to virtually any type of exercise program.• 1 or 2 intervals - 2 seconds to 99 minutes• Repeat up to 99 times• Beep and/or Vibrate alarm• Alarm duration 1, 5, or 10 seconds• Stopwatch function• Compact Size• Water and shock resistant• AAA battery required