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It can be powered by a power supply with a USB interface and a USB adapter. Suitable for Christmas decorative lights, toys, remote control, LED lights, Input USB 5V2A, virtual battery output 4.5V1A, replaces 3 1.5V AA LR6 batteries. USB 5V to 4.5V AA Virtual Battery Power Cord Set Money saving, reusable, no need to replace batteries frequently, the green ones are fake batteries used as conductors.