Features Activity Tracker Smart Watch Function Sleep Monitor Message Notification Heart Rate Monitor Watch, Alarm Clock, Stop Watch, Anti Lost Pedometer, Calorie Counter, Steps Recording, Mileage Tracking Call & Social Media Notification Technical Specifications Strap Material : TPU Screen size & Resolution : 0.96inch TFT, 160*80dpi Battery Capacity : 80mAh Work schedule : 7-10day Stand-by time : 25day CPU : TLSR8251F512ET32/5*5mmQFN32 Step sensor : SC7A20/2*2mm/LGA12 Heart rate chip : SC7R31 Bluetooth version : BLE 5.0 Transmission distance : Up to 10 M RAM ROM Flash : 32KB 512KB 4MB Data storage : 7days Waterproof level : IP67 Charging method : USB Applicable phone : Android 4.4 & above, iOS 9.0 Dimension : 16.5*11.5*145~223mm Weight : 20.7g