Simultaneous Charging Available for Three Batteries It supports simultaneous charging of three batteries at maximum power to make sure they are fully charged and ready to go.Smart Charging Management When the battery is low the charging hub can intelligently charge the battery at maximum power. It will gradually reduces the charging power once the battery is high and automatically stop charging the battery once it is fully charged.Charger Paramater Input 5V/2A Output 4.35V/mA Charging Duration minDual Functions The charging hub can also be served as a battery and Micro SD card storage box which can hold 3 Micro SD cards at the same time.Simple and Clear Light Indicator Power Indicator Light off poweroff Blue Light on poweron Battery Level Indicator Light off poweroff Yellow light on charging but not fully charged Green light on fully charged