Apple Watch Series 3 42mm Smartwatch Cellular Only, Space Gray Aluminum Case. 1.3 Inch (340 x 272) Display, Changeable Faces with Widgets Displays Notifications and Runs Apps, Accelerometer and gyroscope, Heart rate sensor Water-Resistant to 164 feet (50 meters), Heart Rate Monitor, Built-In GPS, Barometric Altimeter Water-Resistant to 164 feet (50 meters), Heart Rate Monitor, Built-In GPS, Barometric Altimeter Brand Name Apple Operating System iOS Item Weight 1.3 pounds Product Dimensions 8.7 x 4 x 1.9 inches Item Dimensions L x W x H 8.7 x 4 x 1.9 inches Color Space Gray Aluminum Case, Black Sport Band Batteries 1 Lithium Polymer batteries required.