The RBX TR3 offers the most in an activity tracker. With a durable and lightweight design, it tracks distance, steps taken, sleep, calories burned, time and heart rate. Also offer useful features such as call alerts, customizable alarms, remote control camera, anti-loss alerts. Also features Wrist Sense, activate your display at the flick of a wrist. Package includes activity tracker, charging cable, and user manual. Wireless compatibility with iOS 7.1+ and Android 4.4+. Free app for smartphones is available on the Google Play Store and the App Store. Features: Heart rate monitor Tracks your steps, distance walked, calories burned and sleep time Easy to navigate app Alerts for phone calls and messages Date and time display activate at the twist of your wrist Bluetooth BLE 4.0 low energy to last longer Specifications: Material: Plastic/Rubber Clasp Type: Push-Through Buckle Product Length: 9.65"