Apple Watch Series 3 Space Gray Aluminum Band - new in box. Series 3 watch features:

Space Gray aluminum case
Built-in GPS and GLONASS
Faster dual-core processor
W2 chip
Barometric altimeter
Capacity 8GB1
Heart rate sensor
Accelerometer and gyroscope
Water resistant 50 meters2
Ion-X strengthened glass
Composite back
Wi-Fi (802.11b/g/n 2.4GHz)
Bluetooth 4.2
Up to 18 hours of battery life3
watchOS 4