The stylish heart rate watch with calorie burn.MIO Drive is designed for fitness enthusiasts who want to maximize their workouts with on-demand, ECG accurate heart rate monitoring. It 's the perfect workout companion, allowing you to follow the progress of your workout with personalized heart rate, % of maximum heart rate display, and calories burned during exercise. MIO Drive features:Easy to use, easy to wear - ECG accurate heart rate WITHOUT a chest strap. Maximize workouts with % of maximum heart rate and visual exertion level indicators. 3500 Calorie Countdown mode specifically designed for MIO 's 3500 Calorie Countdown - a program designed to help you tone up and reach your fitness goals. Dual interval countdown timer. Five (5) exercise timers. MIO 's signature interchangeable watch strap (other colors sold separately). Full-featured sports watch including date/time/calendar, alarm, chime, backlit display with 30 m water resistance. BONUSMioBALANCE Guide, helping you ramp up your fitness regime.