spare chargers compatible with fitbit versa 4 / fitbit sense 2 / fitbit versa 3 / fitbit sense smartwatch, support more than 2000 times repeated insertion-and-extraction test, ensure a longer lasting product lifespan.our sense 2 charger features with complete charge and sync compatibility, offers a fast original charging speed. High-quality copper wires ensures stable performance and strong adaptability.the versa 4 charger cable built-in safeguards, keep your versa 4's battery against overcharge, overcurrent and overvoltage protection, temperature control and foreign object detection ensures device's safety.replacement charger cable to give your (compatible with) fitbit sense a boost in the office, at home, in car or in travels; wide compatible with fitbit versa 3, versa 4, fitbit sense, sense 2, no more for any other models.through the USB connector into your wall charger, car charger or computers, suggest connect this versa 3 charger to power source such as PC for a high efficiency and high stability charging experience.