Amazon.com : Baaletc Extender Band with Buckle Closure for Fitbit Charge HR/ 2 Fitness Tracker Wristbands - Designed for Larger Size Wrists or Ankle Wear, 21mm (Width) x 113mm (Length) : Sports & Outdoors
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Amazon.com: Replacement Battery for Fitbit Charge 3,FB409,fits LSS271621,70mAh/0.27Wh : Electronics