Excelvan OLED Smart Health Bracelet IP67 Waterproof Bluetooth 4.0 Sync Pedometer /Tracking Calorie/ Health Wristband/ Sleep Monitor/ Call Reminder/ Touch Screen Wristband Compatible with Android and IOS Smartphone (Black) Waterproof IP65(Not for shower and swimming) Battery Duration 5-7 days Operating Temperature -20  to 45 Wristband Material TPU Case Material PC