Striiv Fusion sleekest activity/sleep tracker that also delivers incoming call alerts, text/SMS notifications, and other apps from your smartphone. The silky smooth touch screen is simple and easy to use. Connects to the Striiv APP on IOS and Android,Battery is a Lithium ion rechargeable battery with up to a 5 day life , Features are Incoming call notification and text message alerts, Date/Time vibration alarm, 24/7 activity tracking, sleep quality tracking and fun fitness games,upgradable as new features are added to the Striiv APP.