The B3 also allows you to manually set target zones and it will beep to let you when you are not in your zone.

Feature Details:

• EKG accurate within +1 beats per minute or 1%
• Water resistant up to 30 meters
• Includes 1.5 volt battery for wrist receiver
• Built-in lithium battery in monitor averages 2,500 hours of use
• Fitness bullets show accumulated time in target zone as you exercise and total exercise time of your workout
• Memory file features average heart rate, time in zone, and exercise time
• Large display makes it easy to read while exercising
• Easy start/stop function
• Visual and audible alarm in target zones
• Features time of day with an alarm and date/weekday indicator

Note: Polar heart rate monitors are precision instruments; consumers are not advised to change their own battery. Polar recommends that all service be done by an authorized Polar Service Center which will include a warranty for 90 days on repairs and 6 months for batteries.

Manufacturer's Warranty
Two-year warranty

About Polar
The first EKG accurate wireless heart rate monitor was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. The concept of "intensity training" by heart rate swept the athletic world in the eighties. By the 1990s, individuals were looking to heart rate monitors not only for performance training needs, but also for achieving everyday fitness goals. Today, the same concept of heart rate training is being used by world-class athletes as well as everyday people trying to lose weight. Polar is the leading brand among consumers, coaches, and personal trainers worldwide and the company is committed to not only producing the best products, but also being the leading educator on the benefits of heart rate based exercise.