Modern tech with Classic design . This 44mm Carlyle HR touchscreen smartwatch with a amazing featured black silicone strap, google assists speak functionality, Increased storage capacity and three smart battery modes to increase battery life for more days. Fossil Smartwatches powered with Wear OS by Google are compatible with iPhone and Android phones. that smart gear OS by Google and other related marks are trademarks of Google LLC. Touchscreen smartwatches powered with Wear OS by Google require a phone running Android OS 4.4+ or iOS 9.3+ Supported features may vary between platforms.To avoid damage to your watch, only use with included charger. Do not use a USB hub, USB splitter, USB y-cable, battery pack or other peripheral to charge. Product should be kept quite 20cm faraway from implanted medical devices to attenuate potential for RF interference.