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USB5V2A input 4.5V1A 5.5x2.1mm output; positive inside, negatives outside, for various devices with 3AA LR6 batteries For home offices, workshops, or during holiday season illuminating LED decorations or power small electronic gadgets. For LED desk lamp, toy, fan, meter,and more power supply USB 5V2A to 4.5V1A 5.5x2.1mm Power Supply Cable Power Cord ensures reliabled power delivery For 3AA LR03 LR6 LR14 batteries for electronic devices