Austrake Black Replacement USB Charger Charging Cable for Fitbit Flex Wireless Activity Sleep Wristband pack of 3 The Highest Quality Replacement Charging Cables for Fitbit Flex Never Worry About Damaged cables! - LIFETIME WARRANTY From Austrake (Seller: Austrake ) (see below) Hassle Free Shipping and Returns on the fitbit flex charger by fitbit - Free 2 day Shipping with Amazon Prime. Don't Worry About Battery Damage! - Has a PTC to ensure that your Fitbit Flex charger doesn't become damaged by overcurrent This item is only compatible with the Fitbit Flex. It also does not have a reset function.