The weather automatically updates according to location thanks to the built-in satellite location sensors, so it changes when you move to another area.

As for the accuracy of heart rate and sleep monitoring, the device uses a heart rate sensor with blood oxygen measurement and offers sleep monitoring, ensuring good accuracy in health readings. However, as with all smartwatches, accuracy may vary slightly depending on usage and individual conditions.

In summary, the weather updates by changing location and heart rate and sleep are monitored with advanced sensors for good accuracy.