Casio WSD-F10 Smart Outdoor Watch Imported 55mm Case Diameter Compatible with smartphones running Android versions 4.3 and later and iPhones 5 and beyond running iOS 8.2 or above (limited functionality with iPhone) Built-in quad sensors provide real time notification of activity tracking, altimeter, barometer, and compass readings without the need for a phone limited app functionality with iPhones You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!