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Amazon.com: Jassco Smart Watch, Fitness Tracker with Sleep, Running Monitor, Pedometer, Music, IP67 Waterproof Sports Watch Activity Tracker with 1.69'' HD Touchscreen Compatible with iPhone & Android -Black : Electronics
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Watch your heart beat: Is your fitness band lying to you? | | Resource Centre by Reliance Digital
The 4 Best Smartwatches, Fitness Trackers, and Running Watches for 2023 | Reviews by Wirecutter
Amazon.com: Jassco Smart Watch, Fitness Tracker for Android Phones and iPhone with Pedometer, Sleep Monitor, Music Control, IP68 Waterproof Bluetooth Sport Watch Activity Tracker with 1.7'' Touch Screen -Blue : Electronics
What are Smartwatch Sensors and How do they function?