Garmin watch from china

Depends on the model, and whether the watch is indeed a genuine Garmin watch, and not a counterfeit or a prototype. Some models (especially older ones) come in two different hardware/firmware versions - standard (also known as RoW or WW), and APAC versions. Both of them work even outside China, but there may be some minor limitations and differences. APAC models support fewer European languages than the standard models, though they do support English.