Everlast HR4 Heart Rate Monitor Watch - monitors your Heart Rate with the use of a transmitter belt for superior accuracy Features HR Measurement & Warning Alarm when HR exceeds Preset Rate. Stopwatch, Timer, Time & Date Display, EL Backlight. Records up to 4 days. Input info such as Weight, Height, Waist & Age Chinese-automatic Movement Case Diameter: 47mm Water Resistant To 30m (100ft): In General, Withstands Splashes or Brief Immersion In Water, but not Suitable for Swimming or Bathing