The new Coded Suunto t1s feature coded heart rate transmission technology, allowing you to train near others who are also using heart rate monitors without interference to your signal. Training watches in the Suunto t-Series combine streamlined equipment with a user friendly interface that tracks your fitness regimen and suggests adjustments either during or following a workout. All you’ll need to start your optimized fitness regimen is your t-Series Suunto training watch and the Suunto heart rate belt. The t1 heart rate belt does NOT feature ANT technology. The t1 is the ‘bare-essentials’ model in the Suunto t-Series. It monitors your real-time calories burned, provides 3 adjustable heart rate zones plus a heart rate limit alarm if you are over-exerting, and includes a stopwatch. There’s also the standard watch functions (time, date, weekday) as well as a dual time display, backlight, and a single daily alarm. The t1 is the most affordable model in the Suunto t-Series, and its reduced price reflects the absence of certain outstanding features that you’ll find in Suunto’s other personal training watches. The new additions to the t-Series also have interchangeable wristbands in various styles, a smaller face than most other Suunto’s, and a sleeker overall design. Key Features of the Suunto t1 personal training watch Monitors real-time and average heart rate Monitors real-time and average calories burned 3 adjustable heart rate zones Heart rate limit alarm (prevents over-exertion) Stopwatch Standard watch functions (time, date, weekday, dual time display, backlight, alarm)Note: The t1 comes with a medium sized (24-34.5″) chest strap for the heart rate belt.