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The green is fake battery, and 0V is used as conductor Before use, the voltages must be adjusted the device use two batteries to adjust to 3V and installs 1pc green fake battery, and use three batteries to adjust to 4.5V and installs two green fake batteries Suitable for various D size battery powered electronic devices such as holiday LED light, desk lamp, fan, toy, remote controls, clocks, tools, instrument and more Cost saving, without need to frequently replace batteries, can power by charging adapter, portable mobile power supply USB input 5V2A, output 1.5V 3V 4.5V 5W, can replace 1-3pcs 1.5V LR20 D batteries USB 5V2A to 1.5V 3V 4.5V 5W LR20 D size fake battery power supply line, adjustable output voltages