Doing some Christmas shopping but I'm tech savy and I don't know anything about android but I believe the nexus operating sytem is 6.0 and the ad for the watch said any android system operating 4.0 +??
Welcome to Android Central! It's compatible. The main smartwatches to be aware of that are not compatible would be Samsung's line, because most of them are Tizen watches (not Android Wear) that are only compatible with Samsung phones.