About this item Compatibility: This charger is compatible with Fitbit Alta HR, featuring a 3.3 feet USB charging cable (NO Restart Button). Not work with Fitbit Alta Premium & Speedy: The Alta HR charging cable is constructed from high-quality materials, ensuring stable performance and fast charging, taking about 1.5 hours for a full charge. Not work with Fitbit Alta Safe Protection: The charger cable is equipped with a smart chip to protect your Charge 3 from over-current, over-voltage, and short-circuit protection, providing a safe charging environment. Convenient and Easy to Use: Simply plug it into a USB port on your PC, laptop, notebook, or wall charger for charging. For an optimal experience, we recommend using a 5V 1A adapter. Package includes: 2 x charging cable for Alta HR (watch is not included). Dimensions: 5.94 x 3.9 x 0.94 inches.