dfg smart watch hrv activity tracker blood oxygen meter heart rate blood pressure monitor waterproof fitness tracker watch with sleep monitor smart band calories pedometer for women men (black1) unknown smart watch helps you achieve fitness goals and maintain good health. +++ heart rate & sleep tracking: fitness tracker automatically tracking the real-time heart rate and blood pressure, store all historical data at the app. scientific sleep function record the all-day sleep data and analyze your sleeping status by forming an intuitive graph. know more about your health. +++ s-po2& hrv & great battery: smart watch detects blood oxygen, osahs (apnea & hypoxia) and hrv from 00:00 to 07:00 am. normal blood oxygen level is about 96%~99%. 5-7 days of work time and super long standby time in normal mode. automatic detection will cause more power consumption and the battery only lasts for 3~5 days. +++ 10 sports modes : outdoor run, indoor run, outdoor walk, indoor walk, hiking, stair stepper, outdoor cycle, stationary bike, elliptical, rowing machine. help you enjoy your sports life with a smart watch. +++ 1.54 inch touch screen & compatibility: large color screen with soft and comfortable tpu bands. wofit app which is compatible with devices of android 4.4 or ios 9.0 and above. +++ other functions: heart rate alert, blood pressure calibration, hang up phone call, connected gps, event remind, find phone, alarm clock, sedentary reminder, stopwatch, countdown, remote camera, low consumption mode and so on. +++package list: 1 x gt2 smart watch, 1 x charger, 1 x quick guide