Smart Watch Blood Pressure Heart Rate Monitor Bracelet Wristband for iOS Android Tips Due to the long transportation time, the battery may be running low. Therefore, the device may not be turned on.?As this situation, you can charge the battery longer (about 24 hours) to get it back to its original state. Package Include: 1 x Smart Bracelet 1 x User's Manual 1 x Gift box Specification: Name: Smart Bracelet Model: M3 Material: ABS(Acrylonitrile Butadiene Styrene)+PC(polycarbonate) for case, Eco-friendly TPU(thermoplastic urethanes) for wrist strap, 201 stainless steel for button Battery Capacity: 80mah Waterproof: IP65 Color: black, red, dark blue, light blue Size: length:235mm/9.25inch width:22mm/0.87inch thickness:13.5mm/0.53inch Compatible System: bluetooth4.0, for Android4.3 & IOS8.0 or above. Display Screen: 0.96 inch HD IPS color screen FTF process Feature: -USB in-line convenient charging, no charging cable, direct USB charging. -Built-in 80mAh battery, charging time about 2 Hours, normal use time about 7 days, standby time about 15 days. -Push support (Caller, SMS Messenger, app news reminders: QQ/Facebook/Twitter/Wechat, etc.) -Support heart rate / blood pressure / blood oxygen monitoring (This function is for reference only and can not be used for medical data.) -Pedometer (Exercise step, calorie consumption, movement mileage record.) -Support multi sports modes ( Running / Riding / Climbing / Swimming / Pingpong / Walking, etc.) Charging Method: USB Charger: You need to remove the main body from the bracelet first, As long as you have a USB interface, you can charge it at will.