1. Compatibility: The charger is compatible with Fitbit Versa 4 charging cable, Fitbit Versa 3 charging cable, Fitbit Sense charging cable, and Fitbit Sense 2 charging cable. The charging cable is available in 100 cm and 50 cm lengths. You can choose the appropriate length according to your needs. 2. Fast Charging, Stable Performance: Our Fitbit Versa 3 watch charger provides a safer and faster charging mode. A full charge takes less than 2.5 hours. The Fitbit Versa 3 watch magnetically attaches to the charger, ensuring a fit every time. The builtin voltage regulator and current protection circuit guarantee stable and efficient charging. 3. Durable and Reliable: The Fitbit Versa 4 charger is made of quality wiring, tested over 6,000 bends to ensure durability, longevity, and scratch resistance. It delivers an charging experience for your device. The ABSPVC material and copper wiring ensure stable power transmission and charging quality. 4. Safe Charging: This Fitbit Sense charging cable features an internal voltage regulator and PTC to protect your device from overcurrent damage when connected to a power source. With overvoltage and overcurrent protection, it safeguards your watch from potential charging hazards.