Key Features:Built In GPSrecord, Independent GPS recordReal time temperture and height measurementTrack and monitor your health with pedometer and heart rate sensorRugged build and IP67 waterproof rating make it a durable smartwatch optionManufacturer Specifications General :Built-in chip: NRF52832Screen size: 0.95 inch OLEDDisplay resolution: 96x64BluetoothBattery Size: 400mAhBuilt-in BatteryContinuous Usage Time: up to 20 daysCompatible OS: Android 4.4 / iOS 8.0 and above systemWaterproof Rating: IP67GPSSedentary reminderPedometerSleep monitorHeart rate monitorCompanion Function (with smart phone) Calling: Phone call reminderHealth tracker: Sleep monitor, Pedometer, Sedentary reminder, Heart rate monitorNotification: Facebook, Twitter, EmailDimensions :Main Product Dimensions: 280x50x17mm (L x W x D)Main Product Weight: 63gWeight/dimension is for the main item of this boxed product, to help you compare product sizes before buying: please do not base your shipping calculations on this