Apple Watch Series 3 Silver Aluminum Case with White Sport Band Series 3 (GPS) Features Silver aluminum case Built-in GPS, GLONASS, Galileo, and QZSS S3 with dual-core processor W2 Apple wireless chip Barometric altimeter Capacity 8GB Optical heart sensor Accelerometer and gyroscope Ion-X strengthened glass Composite back Wi-Fi (802.11b/g/n 2.4GHz) Bluetooth 4.2 Up to 18 hours of battery life Water resistant 50 meters watchOS 5 Dimensions Height: 42.5mm Width: 36.4mm Depth: 11.4mm Case Weight (GPS): 32.3g Case Weight (GPS + Cellular): 34.9g