With four AA 2100 batteries and USB charging, the Uniross UCU004A USB Compact Multi Charger: Qualities Technology for Batteries Compatibility of Nickel Metal Hydride (NiMH) Block AA, AAA, and 9V Indication of Charging Slots 4 * for LED Light Charging (9V 2 Pieces) The quantity of channels 6Input Micro-USB source: 5VDC 1A 5VDC 2A for USB-C