Key Features:Fitness tracker bracelet comes with a pedometer, distance counter, heart rate monitor and moreIP68 waterproof design can be used in any weather conditionCompatible with both iOS and Android smartphones120mAh battery treats you to 150-hours usage time on a single chargeManufacturer SpecificationsGeneral:Chip model: Nrf52832Display Size: 0.96inch OLED screenScreen resolution: 80x160Heart rate sensor: PAH8001BluetoothSleep monitorPedometerBattery Size: built in 120mAhBattery Standby: up to 150 hoursAlert type: VibrationApp Name: WearfitCompatible OS: Android 4.4 / iOS 8.0 and above systemWaterproof rating: IP68Touch buttonAPP support language: Chinese (simplified/traditional), English, French, Japanese, German, Spanish, Russian, Italian, Malaysian, Portuguese, Korean.Companion Function (with smartphone):Bluetooth calling: Caller IDMessaging: Message reminderHealth tracker: Heart rate, pace, movement patterns, mileage, burn calories, continuous heart rate monitoring, monitorin