Wifly Y5 Smart Band Heart Rate Tracker Fitness Tracker Y5 Smartband Smart Bracelet Waterproof Smart Wristband Smart Watch MenMain functions:Motion recording (step count, distance, calorie calculation), motion mode, message push, information storage, heart rate monitoring, sleep monitoring, blood pressure measurement, blood oxygen saturation measurement, stopwatch, full font language, color display.Specifications: APPJYOUCompatible systemsAndroid 5.1 (above), IOS8.0 (inclusive) and aboveScreen size0.96 inchesBluetoothV4.0Capacity90mAhCharging methodUSBWaterproof ratingIP67Charging timeabout 2HLife timeUse 7 days, standby 15 daysWristband sizetotal length 210MM, adjustable length 120-200MMAppearance MaterialBody: Plastic Wristband: Thermoplastic Elastomer + Stainless SteelAPP Supports 10 languagesChinese, English, Traditional Chinese, Japanese, Korean, French, German, Russian, Polish, Spanish