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Amazon.com: Fitbit Flex Wireless Activity + Sleep Wristband, Black, Pedometer, Small/Large : Sports & Outdoors
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Amazon.com : HUYVMAY Fitness Tracker Pedometer Watch,No App No Bluetooth,1 Hour Charging for 20Days Use, IP68 Waterproof Activity Tracker for Girls Boys Teens Students,Fit Watch with Alarm Clock Step Counter : Sports
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Amazon enters the fitness-tracking business with Halo, says it won't use data for ads - The Economic Times
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