Suggested Retail: $150. SIGNS OF USE. Fitbit Charge 4 Health & Fitness Tracker (Black). The Fitbit Charge 4 (NFC) Activity Tracker is a comprehensive health and fitness tracker that features built-in GPS , 24/7 heart rate monitoring , and up to 7-day battery life . It tracks outdoor activities like runs, rides, and hikes, and provides a workout intensity map. With over 20 goal-based exercise modes, it allows real-time tracking of progress. Additionally, it offers sleep stage tracking, sleep score, and guided breathing sessions. The device is swimproof, water-resistant up to 50M , and supports notifications, apps, and wireless sync. [Reference: SKkEzYIgByg5l6oOtKT7ED]. Type: Regular. 7 CALENDAR DAY FULL REFUND GUARANTEE (FROM PRIMARY PICKUP DATE) ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE (FROM PRIMARY PICKUP DATE) IS ALSO AVAILABLE. THE PRIMARY PICKUP DATE IS THE DAY AFTER THE AUCTION ENDS. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.