Compatible with Google Fitbit Air (sold separately) Fast charging gets you 24 hours of battery life in just five minutes. Or go from 0 to 100% in about 90 minutes 1 Magnetic charger is bi-directional, so you don’t need to think about orientation 1 Charging speed based on use of in-box USB-C at 22 to 30 degrees C. Actual results may be slower. Based on testing, charging speed with fully drained device batteries. Charging testing conducted in 2025 on pre-production hardware and software using default settings with the device powered on. Charging speed depends upon many factors including battery age and ambient temperature.