Dial style: square Surface diameter: 28mm and below Product weight: Single gross weight: 90g Communication type: Bluetooth Packaging list: Watch+strap+instruction manual+charging cable+packaging box Waterproof level: Domestic waterproof Operation mode: touch based Charging method: magnetic suction charging Features: Waterproof, step counting, heart rate monitoring, blood pressure measurement, temperature measurement, Bluetooth communication, sleep monitoring, blood oxygen detection Watch strap style: sporty Case material: Anodized aluminum oxide metal Screen resolution Screen size 280 * 340 2.1 inches Charging method Battery capacity USB magnetic suction 380mAh Compatibility system Usage time IOS10.0 or above Turn on scientific sleep and full day blood oxygen: 5-7 days Android 4.4 or above Turn off scientific sleep and full day blood oxygen: 10-12 days Connection method Waterproof level Bluetooth IP68