Luoov Brand Smart Bracelet Bluetooth Passometer Touch Screen Fitness Tracker Health Wristband Sleep Monitor Smart Watch For Android and IOS Iphone (BLACK) &hellip; CompatibilitySamsung HTC Huawei Nokia Etc all kinds of smart device which have bluetooth function, android 9.0 and above or IOS 4.3 and above,bluetooth 4.0 and above Standby time:It can keep working as long as 1 month if you don't use it,normal, it can work as long as 15 days if you use it Multi function:time display,step counting,distance measure,calorie consumption counting,calling display,message remind,sleep status monitor,shaking and take photo to help your phone Benefits:Less call missed,remind you to do something,keep fit and urge you have a healthy life We promise: 30 days return and exchange, 12 month warrantly. So please be secure to purchase