Smart activity coaching. An enhanced Heart Rate app. Your favorite playlists right on your wrist. A built-in altimeter. And a more powerful processor that lets Siri speak to you. Introducing Apple Watch Series 3. Now you can be more active, motivated, and connected than ever. AppleWatch Series 3, 42mm Stainless Steel Case with Milanese Loop Color: Silver. Gender: Unisex. Age Group: Adult.