You can record, watch Settings, in the personalized options custom hardware button, select recorder, power button click to call out, even 2 is recording.
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The switch button can be set, but just call out the recording function, touch the red circle on the screen to start recording.
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Xiaomi watch uses a curved glass screen, the screen panel is Corning gorilla 3 generation glass material, premium version of some use sapphire glass, the wear resistance of the two watches do not need to worry.