It is compatible product for Fitness Tracker Wristband : Fitbit Flex 2 -with stronger design for a longer lasting product lifespan through the USB connector into your wall charger, car charger or computers. -This spare charging cradle snaps easily. Make your Smart Watch charging become more convenient. -With a reset button on the back of the USB charger. Quickly click the reset button 3 times within 8 seconds, your Fitbit Flex 2 Smart Fitness Tracker will get restarted. (This function is against a system crash) -Length: 17cm-Compact and lightweight design, convenient for travelers and business users. Package included : 1 x USB charging Charger Dock Note : Tracker is NOT included