Specification:  Type: Bluetooth Smart Band.  Color: Black, Blue, Dark blue, Purple, Red.  Compatible OS: Android 5.1, iOS 8.0 or above.  Operating mode: Single touch.  Bluetooth version: 4.0.  App language: Chinese, English, Japanese, Korean, French, German, Russian, Polish, Spanish.  Size: 40.4 x 20.1 x 10.5 mm (1.59 x 0.79 x 0.41 in).  APP: Lefun Health.  Screen size: 0.96-inch color screen.  Battery capacity: 90 mAh.  Band material: Stainless steel, TPU.  Length: 120 – 210 mm (4.72 - 8.27 in).     Feature:  1. Heart Rate Monitor: 24 hour real-time monitoring your heart rate status and help user make proper exercise plan. The heart rate data are only for your reference to adjust your exercise, NOT for medical use.  2. With the green light monitor and precision optical sensor, the heart rate monitor measure the heart rate Blood pressure at the top of the hour automatically. Use the APP to view your weekly health report with diagram and analysis of your walking distance, sleep quality, heart rate, blood pressure, blood oxygen and fatigue index.  3. Fully compatible with various smartphones (Android and Apple's IOS system).  4. Multi-functional Fitness Tracker: Accurately track your steps, distance, calories burnt, sleep quality and heart rate.  5. The smart band will vibrate in specific time to avoid harmful effect of sedentary, then reminds you to take some exercise. When you answer the phone or receive a text message, the smart hand ring will vibrate to remind you The fitness pedometer can remind you when there's phone call and new message by vibrating. Including Facebook, Twitter, WhatsApp, Linkedin, Messenger, etc.never miss the messages that matter.  6. Fashionable Design and Adjustable Strap: 0.96 inch OLED HD Display screen with slim strap for people to wear in different situation. 7. Record daily walking, distance and calories consumption.  8. Sleep monitor & Alarm: Automatically track your sleep quality, and alarm silent vibration will wake you up.  9. Support SMS, WhatsApp, Facebook, Twitter, and other social network site alert. Note: You should allow the notification of the apps in the phone and app.     Package included:  1 X Smart Band Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.