2023-09-22 00:00:00 What is the HUAWEI Band 7: Ultra Slim Design | SPO21 automatic | Up to two weeks of battery life 2 The HUAWEI Band 7 supports automatic SpO21 detection and heart rate monitoring, made possible by HUAWEI TruSeen™ 4.0 and an intelligent power-saving algorithm, and automatically vibrates to alert you if your blood oxygen level or heart rate gets away from the healthy range. Unlimited power