About this item Compatibility: This charger is compatible with Fitbit Alta (without Restart Button), with a 3.3 feet USB charging cable. Not compatible with Fitbit Alta HR Durable & Premium: The Alta charging cable is made of copper wire and durable plastic. A full charge takes about 1.5 hours and works like the OEM charger. It is an excellent choice to replace lost or damaged charging cables. NOT compatible with Fitbit Alta HR Safe Protection: The Alta charger features a built-in PTC, providing stable charging performance and protecting the device from over-current, over-voltage, or short-circuit. Convenient and Easy to Use: To charge, simply plug it into a USB port on your PC, laptop, notebook, wall charger, or car charger. For an optimal experience, we suggest using the recommended adapter (5V 1A). Package includes: 2 x charger for Fitbit Alta (smart watch is not included). Dimensions: 6.1 x 3.94 x 0.75 inches.