Operation System Wear OS Powered by Samsung Size 1.4" Technology Super AMOLED Resolution 450 X 450 px RAM 1.5 GB ROM 16 GB Size 45.5 x 45.5 x 11.0 t Weight 52 g Battery Capacity 361 mAh Sensor BIA Sensor, Compass, Photo Plethysmography, HRM, Electrocardiogram (EGC), Accelerometer (up to 32G), Gyro, Barometer, Ambient Light Bezel Rotating Bezel Button 2 Buttons: Home Key, Back Key