In addition to its weight loss functions, the WM-25 tracks your current, average, and maximum heart rate, while also offering a target alarm that lets you know whether you're working in, above, or below your target heart rate zone. As a result, you'll maximize your caloric burn and enjoy the most effective cardiovascular workout available. Other features include time and date functions, a stopwatch, an audible "alarm off" mode, and an ultra-slim ergonomic chest belt transmitter. The water-resistant WM-25 carries a five-year warranty.