It doesn't look any different than Series 1 or 2. It's what's inside Apple Watch Series 3 that makes all the difference. That starts with a cellular connection, which allows you to take calls, message, and stream music all without your phone. It also has a 70% faster processor, a barometric altimeter for tracking steps climbed and elevation change, and a new fabric sports band option. It's available in three aluminum finishes, two ceramic Edition versions, and a version sans cellular.