The 10-day maximum battery life is tested under the following conditions 30 minutes of Bluetooth calling per week, 30 minutes of music playback per week, heart rate monitoring always on, HUAWEI TruSleep enabled at night, 90 minutes of exercise on average per week (GPS enabled), message notifications enabled (50 messages, 6 calls, and 3 alarms per day), and the device screen turned on 200 times per day. The 7-day typical battery life is tested under the following conditions 30 minutes of Bluetooth calling per week, 30 minutes of music playback per week, heart rate monitoring always on, HUAWEI TruSleep enabled at night, stress detection and auto SpO2 measurement enabled, 180 minutes of exercise on average per week (GPS enabled), message notifications turned on (50 messages, 6 calls, and 3 alarms per day), and the device screen turned on for a total of 30 minutes per day. The 4-day battery life with AOD enabled is tested under the following conditions AOD enabled, 30 minutes of Bluetooth calling per week, 30 minutes of music playback per week, heart rate monitoring always on, HUAWEI TruSleep enabled at night, stress detection and auto SpO2 measurement enabled, 180 minutes of exercise on average per week (GPS enabled), message notifications turned on (50 messages, 6 calls, and 3 alarms per day), and the device screen turned on for a total of 30 minutes per day.