?HEALTHY ASSISTANT?Coffea C2 Smart Band can check your physical index, such as steps, distance, calories burned will help you get a better understanding of your fitness level. It accurately monitors total effective sleeping time and motions every night (including light sleep and deep sleep). ?FASHION DESIGN?Coffea C2 Activity tracker with 0.86'' OLED display screen. Slim, comfortable and easy to wear. It combined with fashion, sports and business. You will barely feel like you have anything on your wrist at all. Charger is attached to the band itself on the top. It goes inside the band. ?GIVE A MATCHED GIFT? The silicone replacement band is easy to install and remove, you can install a different colored band any time you want.Replace different color strap to suit your mood and your outfit! ?BUILT-IN USB CHARGING?The host comes with a standard USB port, specially designed to charge through your PC or mobile driver. All you need is the tracker and a USB port and your trendy pro Wristband will be charged and ready to go in no time! Get it delivered fast and start a healthier life now! ?WIDE COMPATIBILITY? The app supports most smart phones with Bluetooth 4.0. Support system: iOS 7.1 or above (iPhone 4S, iPhone 5/5S/5C, iPhone 6/6S plus, iPhone 7/7S plus, etc.), Android 4.4 or above (Huawei Mate 7/P9, LG, Samsung. etc ). If for any reason you are not satisfied, please do not hesitate to contact us or Amazon customer service.