Solar Battery Charger, Charges 4 AA, AAA, C or D cells + 7 Volt Power Supply Charges 4 batteries at a time. Either AA, AAA, C or D cell rechargable batteries. Comes with USB charging port to charge most cell phones, cameras and other USB devices. . Also has various other charging plugs for charging a variety of electronics. . Weather resistant housing alows for out door use. This model has a blocking diode to prevent reverse power flow at night.