Fitbit Charge 4 monitors heart rate, sleep, and summer runs from $85 (Reg. $130)
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Fitbit Charge 4 (NFC) Activity Fitness Tracker, Rosewood - Walmart.com
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Best Buy: Fitbit Charge 4 Activity Tracker GPS + Heart Rate Rosewood FB417BYBY
Fitbit Charge 4 Fitness Activity Tracker, GPS + Heart Rate Sleep & Swim Tracking | eBay
