Features Made for wrists smaller than 6 3/4 in ECG-accurate heart rate without a chest strap Personalized percent of maximum heart rate display Full calorie management system tracks calories consumed against a daily target Tracks calories burned during exercise Updated case design featuring MIOâ¢'s famous interchangeable straps Full featured watch with time; date; alarm; back light; stopwatch; water-resistant to 10 m Bonus MioSense Guide to Healthy Living with complete list calorie and carbohydrate tables