Do I need to turn on Bluetooth all the time to use the Midong Health Bracelet?

The functions of refreshing data synchronously, reminding incoming calls by SMS, recording running tracks, unlocking the screen, upgrading firmware, etc. all need Bluetooth to open the connected bracelet. If you don't use these functions, the Bluetooth phone can be turned off. It will not affect the functions of the bracelet, such as recording steps, sleeping, cardiovascular health index measurement, HRV measurement, alarm clock and so on.