Heart rate with adjustable limits and includes chest strap. Altimeter shows elevation up to 29,500 feet and logbook tracks real-time vertical gainl/loss, rate of ascent and runs. Barometer keeps 2 day memory and trend graph, shows temperature. Compass aids in navigation. PC interface downloads logbook and heart rate and graphs it to your computer. Heart Rate Functions: Heart Rate Limits Recording Intervals/Total Log Time 2 Seconds/4 Hour 20 Minutes 10 Seconds/22 Hours 60 Seconds/130 Hours Heart Rate Graph Memory Capacity History Memory Altimeter Functions: Altitude Range -500 Meters - 9000 Meters (-1600 Feet - 29,500 Feet) Resolution: 1 Meter (3 Feet) Vertical Speed Total Ascent/Descent Recording Intervals: 20 Seconds, 10 Seconds, and 60 Seconds Real-Time Vertical Cumulative Altitude Alarm Difference Measurement Ascent Speed Alarm Altimeter/Barometer Lock Temperature Compensation Weather Functions: Absolute Barometeric Pressure Sea-Level Pressure Trend Indicator 2 Day Weather Memory Temperature Weather Alarm Compass Functions: Bearing Resolution: 1° Graphic Compass Rose Bearing Tracking Delination Setting Calibration Electronic Higher Accuracy Chronograph Functions: Unlimited Number of Split Times in Log Interval Timer Stopwatch Special Features: Clinometer Watch Functions/General Properties: 12/24 Hour Time Calender Dual Time 3 Daily Alarms Water Resistant to 100 Meters (330 Feet) Metric/Imperial Units User Replaceable Battery Low Battery Warning Backlight Mineral Glass Crystal Button Lock Menu-Base User Interface PC Software Included Suuntosports.com Compatible Composite Housing Material Rubber Strap Total Weight: 56 grams