With a HRM Pro Chest Strap, this Garmin MARQ Athlete Performance Edition Watch is designed for competitors who demand the very best from themselves. Featuring an ultralight design finished with diamond-like carbon for outstanding longevity, this high-performance smartwatch will help you achieve all your fitness goals. At A Glance  Presented on a black silicone rubber band 46mm case size with 100m water resistance Diamond-like carbon coated titanium bezel and case Sunlight-visible display with domed sapphire crystal glass Multiple clock features Health monitoring with abnormal heart rate alerts GPS, accelerometer, gyroscope and thermometer sensors Smart notifications and features Garmin pay Safety and tracking features Activity tracking features Fitness workouts and features Pair and share data from the HRM-Pro chest strap Compatible with iPhone and Android Up to 12 days battery life