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smart watch heart rate blood pressure waterproof fitness tracker watch music control sport mode always-on standaby mode smart wristband for ios android why choose us ? one watch,two modessmart modewhen the always-on mode is off,the watchdial interface,real-time display of current power,exercise data,etc.power off the screen when no operation,lasting escort for your sports health watch modewhen the constant light mode is on,after 5 seconds of inacivity on the watch,automatically switch the s...