Features: Compatible Model: Compatible with Fitbit Inspire & for Inspire HR Fitness Tracker & Ace 2 only. Coming with 2 pack replacement USB charging cable. NOTE: Please connect it to the USB port on the computer for charging. If you connect it to the adapter, the current must not exceed 1A and the Voltage does not exceed 5V.( NOT WORK FOR FITBIT INSPIRE 2) Safe and Fast Charging: Adopting high-quality materials and high-end manufacturing process, make your watch charging faster and stable. Built-in short-circuit and overload protection, provide stable and safe charging for you. PTC(internal power protection) keeps your for Fitbit Inspire HR safe. Plug & Play: The charger cord designed with USB port. You can charge your for Fitbit Inspire & for Inspire HR by plug your laptop, PC, Mac, Notebook USB port or 5V/1A adapter. Charge cable is easy to carry on and making it convenient for you to charge your watch. Simply & Portable: 3.3ft long charging cable provides you convenient use and the flexibility you need. With this special designed charging dock, you don’t have to remove your watch band while charging. Tips: Make sure that there's no fan or vibration on the same surface as the device when you charging. If so, we suggest that you place the tracker on a different surface without any vibrations, avoid the cable too short and easy to loosen, leading to charging failure and see if the issue persists. Note: 1.Designed for Fitbit Inspire, for Inspire HR and for Fitbit Ace 2 only, not for fitbit inspire 2 and other models. 2.Please connect it to the USB port on the computer for charging. 3.If you connect it to the adapter, the current must not exceed 1A and the Voltage does not exceed 5V. 4. If the project does not work, in order to confirm the problem caused by which part (magnetic shock or charging current voltage), please try to use another cable to recharge. 5.When charging, please make sure that you have plugged it into for fitbit correctly (the metal contact should be aligned with the interface for fitbit) 6.Make sure that there's no fan or vibration on the same surface as the device when you charging. If so, we suggest that you place the tracker on a different surface without any vibrations, avoid the cable too short and easy to loosen, leading to charging failure and see if the issue persists. 7.Please ensure the voltage is stable. If the voltage is unstable, please stop using! 8.Package Included: 2 x Charging Cable for Fitbit Inspire and for Inspire HR (3.3Ft/100CM+3.3Ft/100CM)