Wearfit Pro app Bluetooth: IP68 Waterproof Bluetooth 5.0+ Bluetooth 3.0 Material: IML (zinc alloy) and stainless steel Screen type: IPS full viewing angle color screen; screen size: 2.2 inches; resolution: 458*518 3.7V, 400mAh battery 2.5 hours of charging, 3–5 business days, and 60 days of standby