Garmin v&iacute;voactive HR GPS Smart Watch, Regular fit - Black Regular fits wrist circumferences 5.39" to 7.68" (137 to 195 mm),GPS smartwatch with a sunlight-readable, high-resolution color touchscreen. Display size-28.6 mm x 20.7 mm.Display resolution:205 x 148 pixels 24/7 HEART RATE MONITORING - Elevate wrist heart technology gives you heart rate all day and night without an additional strap,Heart rate is not available while swimming LONG BATTERY LIFE - Up to 8 days in watch/activity tracking mode. Battery life : GPS mode: Up to 13 hours. Smartwatch mode: Up to 8 days SMART NOTIFICATIONS - Set any notification from your mobile device to display when paired with a compatible smartphone.Water rating:5 ATM, Compatible with Android 4.4 OS or Later,Bluetooth 4.0 or Later and AppleiOS 10.0 or Later,iPhone, iPad, iPod touch