NEW Product Description: Xiaomi mi band Main Features Waterpoof (IP67) 10-20 day standby power Sleep-cycle smart alarm Fitness monitor & sleep tracker Passometer & call reminder (bluetooth 4.0 version) Running MIUI Android 4.4 and above Unlock your Xiaomi phone without a password Monitoring of heart rate Real-time monitoring and recording， scientific planning exercise During aerobic exercise， maintain a good heart rate， can better reduce fat and improve heart and lung capacity. In the heart rate sensor using photoelectric light perception edition bracelet in， real-time motion of the heart rate detection and prompt， so you adjust the motion state of science， sustainable and efficient consumption of fat. Millet sports with running APP function， monitor your trajectory， pace， heart rate， manage the state of motion every moment. * To be with the use of light-sensitive version of the bracelet What are the updates on Xiaomi Mi Band 1S Light-sensitive Version? 1. Built in-heart rate sensor Real-time monitoring of the heart rate is the most important indicator for judging the aerobic / anaerobic exercise. With the App called Mi Fit， Xiaomi Mi Band 1S Light-sensitive Version can monitor your moving track， pace and heart rate， makes you can manage your own movement state more scientifically. 2. Mi Band sensor is less likely lost Light-sensitive Version uses the latest thermoplastic elastomer material whose elasticity and toughness is stronger than standard version. No matter how you swing it， the Mi Band sensor won't be lost.Color: black， red， blue， green， orangehttp://contestimg.wish.com/api/image/rating?name=b426702c7b8911e68b9c065f903a9ac5.jpg&w=1000&h=1000&m=0&t=0