L8star Fitness Tracker HR, Activity Tracker with 1.3inch IPS Color Screen Long Battery Life Smart Watch with Sleep…

Amazon.com Price: $24.53 (as of 07/23/2021 22:41 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