Lin store Fitness Tracker, Bluetooth Wireless + Sleep Waterproof Smart Watch Wristband Braceket (Green) A perfect gift for your famlies to care more about their health Tracks steps, distance, calories burned and active minutes, Monitor how long and well you sleep, Wakes you (and not your partner) with a silent wake alarm Touch Operated Screen, Time date display, anti-lost alert Bright OLED Display: 0.91 inch OLED screen allow you to check time, date, steps, calories, working distance, message, caller ID freely You can scan the qr code on the specification or wristband box, and download the app"Power Sensor" to connect the wristband and your phone.