A compact, handsome and smart feature-packed wrist assistant, this is the Amazfit GTS 4 Mini. It will adorn your wrist with up to 15 days of battery life and water resistance. At the same time, it will assist you in more than 120 sports modes, be it walking, running, swimming, fitness or any other. It measures and reports: heart rate, oxygen saturation, stress level and sleep quality. It will also allow you to make a period calendar. Amazon Alexa support makes it easy to use. When connected to your phone via Bluetooth, it also shows you text messages and calls, as well as the weather, alarm clock, To Do List and scheduled events. For a mini wrist assistant, it will do a lot for you.