This USB charger is designed specifically for Jawbone's UP2, UP3, and UP4 activity fitness wristbands. Keep your Jawbone charged and ready to use with this replacement charger. It features a compact design for easy storage and portability, and can be used with any USB port to charge your wristband quickly and efficiently. Additionally, this charger comes in a sleek gray color and is perfect for those who enjoy running and jogging. It is essential for keeping your activity tracker up and running, so you can track your progress and achieve your fitness goals. Don't let a dead battery hold you back - get this replacement charger today.