Designed for athletes on foot, bike, ski or skate, this multisport system provides comprehensive Heart Rate Monitoring while tracking speed and distance across a wide variety of outdoor activities. SUUNTO T3 More than a heart rate monitor, the Suunto T3 helps you maximize results by providing real-time information on the training effect of your workout. Transending the conventional heart rate monitor, the Suunto T3 logs your workouts, tracks your physiological progress, and displays training effect - the cardiovascular benefit of your workout on a simple, one-to-five scale. Are you over or under training? Sweating hard enough to reach your goals? The Suunto T3 knows and tells all... Heart Rate Calories Burned Dual Time Date Alarm Stopwatch with Splits and Laps Case Width 42mm SUUNTO GPS POD Bring the ultimate in accurate speed and distance sensing to your Suunto Training Instrument. GPS-Based speed and distance sensor for all outdoor sports clips fast and easy to your arm or any strap or belt Easily operated with one-button - one-mode Send 2D speed/distance information at speeds less than 20km/h. When speed is 20km/h or faster the POD sends 3D Speed/Distance information to the wristop so you will be able to measure altitude changes. Two user-replacable batteries last a minimum of 10 hours (Size AAA) It's small for a GPS with approxmiate dimensions: 68mm Diameter (about 2 and 2/3 inches), 22mm Thickness And it's light, only 77 grams (only 2 and 2/3 ounces), including batteries, but not including clip-fix and strap