L8star Fitness Tracker, Continuous Heart Rate Monitor IP67 Waterproof Smart Activity Tracker with 6 Sports Mode,Sleep…

Amazon.com Price: $25.99 (as of 05/12/2022 22:01 PST- Details)

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Smart watch 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 5 days, normal use 10 days

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