Apple Watch Series 3 Smart Watch - Wrist - Barometer, Optical Heart Rate Sensor, Accelerometer, Altimeter, Gyro Sensor - Music Player, Text Messaging - Heart Rate, Sleep QualityDual-core (2 Core)

S3 with dual-core processor Optical heart sensor Ion-X strengthened glass Accelerometer and gyroscope W2 Apple wireless chip Silver aluminum case Built-in GPS, GLONASS, Galileo, and QZSS Capacity 8GB Barometric altimeter Composite back