How long for fitbit alta hr to charge

Fitbit Charge 2 Wristband Charging Cable for HR/One/Force/Surge/Blaze/Alta

USB Charging Cable for Fitbit Alta HR Replacement Charging Cable Charger Adapter for Fitbit Alta Band

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55cm Replacement USB Charging Cable Cord for Fitbit Alta HR

Charger USB Charging Cable Dock Stand for Fitbit Alta HR Smartwatch 0.5m Length Cable