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USB to two 2xAA battery elimination cable, widely used for decorative LED lights, talkies, doorbells, toy, remote control, . Input USB 5V2A, output 4.5V1A, convenient for use, replacing 3 1.5V LR6 AA batteries. Replacing three 1.5V LR6 AA batteries, the product can be used to power two 4.5V AA batteries simultaneously. Save money and be , eliminating the need for frequent battery replacement. It can be powered by a mobile power supply, computer, or USB adapter.