Features Passometer，Sleep Tracker，Message Reminder，Call Reminder，Unlock Xiaomi Phones，Heart rate monitoring45mAh Battery 45mAhIP67 Waterproof IP6736x14x9mm Host Size 37x13.6x9.9The Xiaomi bracelet has function of record the sport date in every day， sleep quality monitoring， smart alarm clock wake up.You can view real-time physical activity through mobile applications， monitoring the effect of walking and running， you can identify more sport through the clouds.Xiaomi bracelet can automatically determine whether to sleep， deep sleep and light were recorded and summarized sleep time to help users monitor their sleep quality.it can connect with your android 4.4 mobile phone(support connect the system with android 4.4 or more high)， the Battery can support 30 days.Type: On WristApplication Age Group: AdultFunction: Passometer，Fitness Tracker，Sleep Tracker，Message Reminder，Call Reminder，Heart rate monitorCompatibility: All CompatibleLanguage: English，Russian，Spanish，ChinesHeart rate monitoring function!For Xiaomi Devices:Compatible with Mi4，Mi3，Redmi Note 4G，Redmi 2，Mi Note，Redmi Note 2For i/os Devices: All Devices with I/OS 7.0 above.For Android Devices: Android 4.4 Above and support Bluetooth 4.0.Time to market: Real StockWe also provide the service that ships the item from spain，ships out within 3days.it's a good gift for your family.You can also buy xiaomi mi band from our store，the different between mi band and mi band 1s as below: mi4ibandClick the picture to buy now >Xiaomi Mi Band (Buy Now >) Model Xiaomi Mi Band 1S HTB18WSQKpPassometer，Sleep Tracker，Message Reminder，Call Reminder，Unlock Xiaomi PhonesPackage Weight: 0.400kg (0.88lb.)Package Size: 25cm x 20cm x 10cm (9.84in x 7.87in x 3.94in)