You can talk to Amazon Alexa on your Amazfit Band 5. Ask Alexa questions, get translations, set alarms and timers, create shopping lists, check the weather, control your smart home devices and more. When you feel unwell, especially during intellectual or physical work for a long time, high-intensity workouts such as marathons and gym workouts, or in high-altitude and low-oxygen environments, you can immediately measure your blood oxygen saturation and understand your physical state. Equipped with the newly upgraded huami-proprietary BioTrackerTM 2 PPG bio-tracking optical sensor, the band delivers heart rate measurement accuracy comparable to that of professional heart rate monitoring equipment. Amazfit Band 5 professionally interprets the sleep characteristics at each stage and analyze sleep quality, to help you adjust your sleep habits. It even monitors your 20-minute daily nap. Amazfit Band 5 can help you keep track of your menstrual cycles and ovulation periods, and alert you before they arrive. Sports modes include Outdoor running, Walking, Cycling, Treadmill, Pool swimming, Freestyle, Indoor cycling, Elliptical, Jump rope, Yoga, Rowing machine.