Model Numbers

GPS Only

A1977 (40mm), A1978 (44mm)

GPS + Cellular

A1975 (North America, 40mm), A2007 (Europe, Asia Pacific, and China mainland, 40mm) A1976 (North America, 44mm), A2008 (Europe, Asia Pacific, and China mainland, 44mm)

GPS + Cellular models feature a red ring on the Digital Crown.

Features a thinner body compared to the previous series.

The back cover is black ceramic with 'Series 4' written on it.