Garmin Fenix 3 HR, Gray WRIST-BASED HEART RATE - Garmin Elevate wrist heart rate technology measures heart rate at the wrist, giving you the option to track your heart rate data without wearing a chest strap - Activity Tracking Accuracy BLACK SILICONE BAND - Soft, flexible black silicone band adds luxurious feel with resistance to discoloration CHROMA DISPLAY - 1.2 sunlight-visible high-resolution color Chroma optically-bonded display. Physical dimensions(Inches) - 2.0 x 2.0 x 0.6. Display resolution, WxH - 218 x 218 pixels transflective MIP color sapphire lens WATER RATING - Water rated up to 10ATM / 100 meters; suitable for swimming and display size, WxH is 1.2 inch (30.4 mm) diameter WIRELESS CONNECTIVITY- Utilize one or more Wi-Fi hot spots to automatically sync your data with Garmin Connect and update software (when in range)