Ultra lightweight, only weighs 32g, as light as three cherries or two batteries. AMAZFIT Smart Watch is built-in 190mA lithium polymer battery, allows standby time up to 45 days and continuous GPS tracking up to 22 hours. Support accurate heart rate montoring, pedometer, all-weather display, GPS, call reminder, alarm reminder, sedentary reminder, SMS, App notification, etc. Built-in Sony28 nm low-power GPS chip, using GPS + GLONASS dual-mode positioning to search satellite signals, you can real-time track and record the trajectory, mileage and other sports data. Professional IP68 waterproof.