Amazfit GTR 4 is the best wrist assistant ever. It allows to monitor the condition of the body in parallel with more than 150 sports activities. It measures: heart rate and breathing rate, stress level, blood oxygen content. Suitable for outdoor, indoor and water sports activities. It is water resistant to a depth of 50 meters. Shows special care for women, helps in the process of menstrual cycle and pregnancy monitoring. It makes communication even more flexible through Bluetooth and the Zepp app - it shows you incoming text messages, calls and allows you to answer them. It also notifies you of events marked in the smartphone's calendar. In addition, it also has an alarm clock function