Designed to work with both first-generation 3200mAh X System batteries as well as current 3400mAh batteries, the Hasselblad X Battery Charging Hub charges two batteries simultaneously. This dual-slot system features an integrated USB Type-C connector supports power from the included AC power supply or from an external USB battery supply (sold separately). Easily check battery capacity or monitor charging status with front-facing LED indicators. First-generation 3200mAh batteries recharge completely in about three hours, while two current 3400mAh batteries charge in approximately two hours and 48 minutes. An audible chime sounds when charging is complete.