L8star Fitness Tracker, Smart Watch Heart Rate Activity Tracker with 1.3 inch IPS Color Screen Long Battery Smart Watch…

Amazon.com Price: $13.95 (as of 03/27/2023 16:27 PST- Details)

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Heart rate and sleep monitoring, it will measure your heart rate on every 1 or 2 or 6 or 12 hour automatically, clearly acknowledge your physical fitness status at whole day or week or month
Long battery life, charge 2 hours, standby 7 days, normal use 15 days