HeHa Waterproof HRV Monitor Smart Fit Watch Heart Rate Health Activity Fitness Tracker with Pedometer Step Counter Do you really know how to live a healthy life? The HeHa fitness tracker is heart rate monitor, a step counter and a sleep monitor, which provides a big boost in accuracy in terms of the calorific burn from your day.The most important is the heart rate monitor, which uses dry electrode technology to collect accurate electrocardiograph signals and heart rate, while other similar devices adopt photoplethysmography technology to observe heart rate through monitoring blood flow. A long battery life is important. Sustained heart rate monitoring in real-time and displayed on the screen increase the power consumption, and charging will reduce the battery life. A fully charged HeHa Qi can function for more than 20 days, the leader among similar products. IPX7 Waterproof. Note IPX7 designation, able to withstand immersion in water up to 1M for up to 30 minutes. This means that a session in the shower, getting caught in the rain, or washing your hands will not cause damage, but prolonged exposure - such as swimming - would be harmful. The fitness tracker have a clip. While most trackers wrap around your wrist, HeHa fitness tracker have a clip, which clip on to your clothing and can be more comfortable to wear. Buy with confident: Items shipped from Amazon and can be returned within 30 days