Misfit Ray - Fitness + Sleep Tracker with Black Sport Band (Carbon Black) Vibration alerts for call and text notifications, movement reminders, and alarms Smart button enabled to control connected household devices Swim proof, anodized aluminum cylinder with multicolor LED progress display Automatically tracks steps, distance, calories, and light and heavy sleep Non-charging, replaceable batteries last up to 6 months NOTE: Refer the User Guide from the Technical Specification before use which is highly recommended.