This 44mm Gen 5E touchscreen smartwatch features a brown leather strap, speaker functionality, 4GB storage capacity, and three smart battery modes to extend battery life for multiple days. Compatible with iPhone and Android phones. 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 device to charge. Product should be kept more than 20cm away from implanted medical devices to minimize potential for RF interference.