1. Shutdown/pause button/return to the main interface Press and hold for 2 seconds to shut down/start up. During startup, short press to pause real-time data, and short press again to continue real-time data. Short press this button on any interface other than the main interface to return to the main interface function (pause or real-time icon reminder) 2. Page turning button Short press to cycle through the three functional interfaces Real-time > maximum + average + total > histogram (with interface navigation bar), When switching to the other two interfaces, it stays for a long time, unless switching back or short pressing 1 key to return to the main interface 3. Mute/Vibration button/Screen off Short press to cycle through reminder modes: only sound reminder-only vibration reminder-sound and vibration reminder-close reminder "This button has no function in other interfaces (since other pages do not display sound and vibration reminder icons, so other interfaces do not set the function of this button) Long press to turn off the screen, short press any button to turn on the screen during the off-screen period" 4. Set the alarm value Short press to enter the alarm value setting: short press once is the maximum alarm, short press again is the total alarm. Long press in these two interfaces to enter the setting, the alarm value flashes during setting, Short press the page turning button to select the alarm value. Short press again to save and exit. In the two interfaces of 4, there is no operation for 5 seconds or short press the 1 button to save the current settings and exit to the main interface. interactive description.