Case Size. 40mm, 44mm. Features. LTE and UMTS, Built-in GPS, GLONASS, Galileo, and QZSS, S6 with 64-bit dual-core processor, W3 Apple wireless chip, U1 Ultra Wideband chip, Barometric altimeter, Capacity 32GB, Blood oxygen sensor, Optical heart sensor, Electrical heart sensor, Improved accelerometer up to 32 g‑forces, Improved gyroscope, Ambient light sensor, LTPO OLED Always-On Retina …

https://www.amazon.com/New-Apple-Watch-GPS-Cellular-40mm/dp/B08J5SDNJD