Charge status indicators LED indicators display the charge status of each battery independently in five steps. Safe operation The BC-ZD1 has been designed specifically for Sonys NP-FZ100 batteries with ample heat dissipation measures plus temperature monitoring and control built in. Compact and portable A flat low-profile design that measures just 84.5 x 29.2 x 70.0 mm (3 3/8 x 1 3/16 x 2 7/8 inches) takes up little space even when multiple units are used simultaneously. NP-FZ100 batteries USB PD compatible power supply and USB cable not included. Please purchase NP-FZ100 batteries a USB PD compatible power supply with 30 W or higher output and a USB cable that can handle 3 A or higher current separately. Simultaneous two-battery charging requires a USB PD compatible power supply that can deliver 30 W or higher. Single-battery charging requires a USB PD compatible power supply that can deliver 18 W or higher. A USB cable that can handle 3 A or more is required in both cases. Charge time may vary according to use conditions. The CHARGE lamps will turn off when battery charge level exceeds 90% (operational charge). Continue charging for another 30 minutes to achieve a full charge.